# CKEditor 4 configuration options compatibility

The following table presents CKEditor 4 configuration options and, if available, their equivalent in CKEditor 5.

> **Note**
>
> In CKEditor 5, the number of options was reduced on purpose. Configuring CKEditor 4 was too troublesome due to the number of available configuration options (around 300). This is why when designing CKEditor 5 from scratch, we decided to come up with a simplified editor, with well-thought default behavior, based on the results of the [Editor Recommendations](http://ckeditor.github.io/editor-recommendations/) project.

| CKEditor 4                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | CKEditor 5                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [`allowedContent`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-allowedContent)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | You can extend the list of HTML tags or attributes that CKEditor 5 should support via the [GHS (General HTML Support) feature](../../features/html/general-html-support.md). The GHS allows adding HTML markup not yet covered by official CKEditor 5 features into the editor's content. Such elements can be loaded, pasted, or output. It does not, however, provide a dedicated UI for the extended HTML markup.You can get full-fledged HTML support by writing a plugin that (ideally) provides also means to control (insert, edit, delete) such markup. For more information on how to create plugins check the [Creating a basic plugin](../../framework/tutorials/creating-simple-plugin-timestamp.md) article. Looking at the source code of CKEditor 5 plugins may also give you a lot of inspiration.CKEditor 5 will only preserve content that is explicitly converted between the model and the view by the editor plugins. Check the [conversion documentation](../../framework/deep-dive/conversion/intro.md) to learn how to extend the conversion rules.                                                                                                                                                                                         |
| [`applicationTitle`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-applicationTitle)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A. CKEditor 5 does not label the surrounding application region, but you can name the editing area itself. See [`config.title`](#title).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| [`autoEmbed_widget`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autoEmbed_widget)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Refer to the [Media embed](../../features/media-embed/media-embed.md) feature guide to learn more about media embedding in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| [`autoGrow_bottomSpace`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autoGrow_bottomSpace) [`autoGrow_maxHeight`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autoGrow_maxHeight) [`autoGrow_minHeight`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autoGrow_minHeight) [`autoGrow_onStartup`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autoGrow_onStartup)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | These settings are no longer needed as CKEditor 5 automatically grows with content by default.[Classic editor](../../examples/builds/classic-editor.md) in CKEditor 5 no longer encapsulates the editing area in an `<iframe>`. This means that you can control the height (and similar options) of the editing area with CSS. For example, you can set the `minHeight` and `maxHeight` options with the following code:```css
.ck.ck-content:not(.ck-comment__input *) {
	/* Note: You can use min-height and max-height instead here. */
	height: 300px;
	overflow-y: auto;
}
```                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`autoUpdateElement`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autoUpdateElement)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | CKEditor 5 always updates the replaced element. This behavior cannot be disabled.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| [`autocomplete_commitKeystrokes`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autocomplete_commitKeystrokes)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | The [Mentions](../../features/mentions.md) feature provides autocompletion in CKEditor 5. Use the [`config.mention.commitKeys`](../../api/module_mention_mentionconfig-MentionConfig.md#member-commitKeys) option to choose the keys that accept the highlighted item.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| [`autolink_commitKeystrokes`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autolink_commitKeystrokes) [`autolink_emailRegex`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autolink_emailRegex) [`autolink_urlRegex`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-autolink_urlRegex)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Refer to the [Autolink section](../../features/link.md#autolink-feature) of the Link guide to learn more about support for automatic linking in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| [`baseFloatZIndex`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-baseFloatZIndex)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | N/A. There is a dedicated [issue about z-index management](https://github.com/ckeditor/ckeditor5/issues/5352) and making it more open for developers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| [`baseHref`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-baseHref)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Not supported yet, see [the relevant GitHub issue](https://github.com/ckeditor/ckeditor5/issues/665).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| [`basicEntities`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-basicEntities)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`blockedKeystrokes`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-blockedKeystrokes)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`bodyClass`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-bodyClass)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | [Classic editor](../../examples/builds/classic-editor.md) in CKEditor 5 no longer encapsulates the editing area in an `<iframe>`, so this setting is no longer needed. Wrap the editor with a `<div class="...">` to achieve a similar result. When using [balloon](../../examples/builds/balloon-editor.md), [balloon block](../../examples/builds/balloon-block-editor.md), [inline](../../examples/builds/inline-editor.md), or [decoupled](../../examples/builds/document-editor.md) editor, you may add a class to the element on which the editor is initialized.You can also declare the CSS classes in the configuration. Pass an element definition to the [`config.root.element`](../../api/module_core_editor_editorconfig-RootConfig.md#member-element) option and list them in its `classes` field. This works in all editor types, including classic, where the definition describes the editable element that the editor creates inside its UI box. Refer to the [Root types](../../getting-started/setup/root-types.md#applying-classes-and-styles) guide for an example.Additionally, all editor types use `.ck-content` on their main root editable elements. This class can thus also be used to write style sheet rules for the editor content. |
| [`bodyId`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-bodyId)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | [Classic editor](../../examples/builds/classic-editor.md) in CKEditor 5 no longer encapsulates the editing area in an `<iframe>`, so this setting is no longer needed. Wrap the editor with a `<div id="...">` to achieve a similar result. When using [balloon](../../examples/builds/balloon-editor.md), [balloon block](../../examples/builds/balloon-block-editor.md), [inline](../../examples/builds/inline-editor.md), or [decoupled](../../examples/builds/document-editor.md) editor, you may add a class to the element on which the editor is initialized.You can also set an `id` in the configuration. Pass an element definition to the [`config.root.element`](../../api/module_core_editor_editorconfig-RootConfig.md#member-element) option and declare it in the `attributes` field. This works in all editor types, including classic.Additionally, all editor types use `.ck-content` on their main root editable elements. This class can thus also be used to write style sheet rules for the editor content.                                                                                                                                                                                                                                  |
| [`browserContextMenuOnCtrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-browserContextMenuOnCtrl)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | No longer needed as CKEditor 5 does not have a context menu and does not block the native browser context menu.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| [`clipboard_defaultContentType`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-clipboard_defaultContentType) [`clipboard_handleImages`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-clipboard_handleImages) [`clipboard_notificationDuration`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-clipboard_notificationDuration)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | N/A for the content type and notification options. To turn pasted and dropped images into base64 strings, as `clipboard_handleImages` did, use the [Base64 upload adapter](../../features/images/image-upload/base64-upload-adapter.md). Refer to the [Image upload](../../features/images/image-upload/image-upload.md) guide for the other available strategies.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| [`cloudServices_tokenUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-cloudServices_tokenUrl)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | See [`config.cloudServices.tokenUrl`](../../api/module_cloud-services_cloudservicesconfig-CloudServicesConfig.md#member-tokenUrl).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| [`cloudServices_uploadUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-cloudServices_uploadUrl)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | See [`config.cloudServices.uploadUrl`](../../api/module_cloud-services_cloudservicesconfig-CloudServicesConfig.md#member-uploadUrl). Check out the comprehensive [Image upload](../../features/images/image-upload/image-upload.md) guide to learn more.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| [`codeSnippetGeshi_url`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-codeSnippetGeshi_url) [`codeSnippet_codeClass`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-codeSnippet_codeClass) [`codeSnippet_languages`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-codeSnippet_languages) [`codeSnippet_theme`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-codeSnippet_theme)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | Refer to the [Code block](../../features/code-blocks.md) feature guide to learn more about support for blocks of pre-formatted code in CKEditor 5.A plugin adding support for the inline `<code>` element is included in the [Basic styles](../../features/basic-styles.md) package.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`colorButton_backStyle`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-colorButton_backStyle) [`colorButton_colors`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-colorButton_colors) [`colorButton_colorsPerRow`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-colorButton_colorsPerRow) [`colorButton_contentsCss`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-colorButton_contentsCss) [`colorButton_enableAutomatic`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-colorButton_enableAutomatic) [`colorButton_enableMore`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-colorButton_enableMore) [`colorButton_foreStyle`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-colorButton_foreStyle) [`colorButton_historyRowLimit`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-colorButton_historyRowLimit) [`colorButton_normalizeBackground`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-colorButton_normalizeBackground) [`config.colorButton_renderContentColors`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-colorButton_renderContentColors)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Refer to the [Font family, size, and color](../../features/font.md#configuring-the-font-color-and-font-background-color-features) feature guide to learn more about configuring font and background color in CKEditor 5.CKEditor 5 also provides a new highlight plugin. It allows for highlighting parts of the text with the `<mark>` element with different CSS classes that can be styled. See the [Highlight](../../features/highlight.md) feature guide for more information.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`contentsCss`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-contentsCss)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | [Classic editor](../../examples/builds/classic-editor.md) in CKEditor 5 no longer encapsulates the editing area in an `<iframe>`, so such file and configuration setting is no longer needed. If for some reason you need to style the contents of the editing area differently, use the `.ck-content` selector.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| [`contentsLangDirection`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-contentsLangDirection)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Refer to the [Setting the language of the content](../../getting-started/setup/ui-language.md#setting-the-language-of-the-content) guide to learn how to set the content direction using the [`config.language`](../../api/module_core_editor_editorconfig-EditorConfig.md#member-language) configuration option.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| [`contentsLanguage`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-contentsLanguage)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Refer to the [Setting the language of the content](../../getting-started/setup/ui-language.md#setting-the-language-of-the-content) guide to learn how to set the content language using the [`config.language`](../../api/module_core_editor_editorconfig-EditorConfig.md#member-language) configuration option.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| [`contextmenu_contentsCss`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-contextmenu_contentsCss)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | No longer needed as CKEditor 5 does not have a context menu.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [`copyFormatting_allowRules`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-copyFormatting_allowRules) [`copyFormatting_allowedContexts`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-copyFormatting_allowedContexts) [`copyFormatting_disallowRules`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-copyFormatting_disallowRules) [`copyFormatting_keystrokeCopy`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-copyFormatting_keystrokeCopy) [`copyFormatting_keystrokePaste`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-copyFormatting_keystrokePaste) [`copyFormatting_outerCursor`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-copyFormatting_outerCursor)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | Refer to the [Format painter](../../features/format-painter.md) guide to learn how the copy formatting functionality works in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| [`coreStyles_bold`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-coreStyles_bold)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | CKEditor 5 uses the `<strong>` element, see [Editor Recommendations - Bold](https://ckeditor.github.io/editor-recommendations/features/bold.html).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| [`coreStyles_italic`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-coreStyles_italic)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | CKEditor 5 uses the `<i>` element, see [Editor Recommendations - Italic](https://ckeditor.github.io/editor-recommendations/features/italic.html).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| [`coreStyles_strike`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-coreStyles_strike)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | CKEditor 5 uses the `<s>` element, see [Editor Recommendations - Strikethrough](https://ckeditor.github.io/editor-recommendations/features/strikethrough.html).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| [`coreStyles_subscript`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-coreStyles_subscript)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | CKEditor 5 uses the `<sub>` element.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`coreStyles_superscript`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-coreStyles_superscript)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | CKEditor 5 uses the `<sup>` element.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`coreStyles_toggleSubSup`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-coreStyles_toggleSubSup)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | In CKEditor 5 it is possible to apply subscript and superscript to the same element.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`coreStyles_underline`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-coreStyles_underline)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | CKEditor 5 uses the `<u>` element, see [Editor Recommendations - Underline](https://github.com/ckeditor/editor-recommendations/issues/4).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| [`customConfig`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-customConfig)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | For performance reasons, CKEditor 5 no longer loads a separate configuration file. Passing configuration options inline reduces the number of HTTP requests.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [`dataIndentationChars`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-dataIndentationChars)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`defaultLanguage`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-defaultLanguage)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | The support for multiple translations is handled by the translations service. See the [UI language](../../getting-started/setup/ui-language.md) feature guide.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| [`delayIfDetached`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-delayIfDetached) [`delayIfDetached_callback`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-delayIfDetached_callback) [`delayIfDetached_interval`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-delayIfDetached_interval)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`devtools_styles`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-devtools_styles) [`devtools_textCallback`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-devtools_textCallback)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | The old CKEditor 4 Developer Tools plugin is not available for CKEditor 5. However, check out the new [CKEditor 5 inspector](../../framework/development-tools/inspector.md). It is a far more advanced tool that will give you tons of useful information about the state of the editor such as internal data structures, selection, commands, and many more.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| [`dialog_backgroundCoverColor`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-dialog_backgroundCoverColor) [`dialog_backgroundCoverOpacity`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-dialog_backgroundCoverOpacity)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | The use of configuration options to style selected parts of the editor was dropped in favor of much more powerful [theme customization](../../framework/deep-dive/ui/theme-customization.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| [`dialog_buttonsOrder`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-dialog_buttonsOrder) [`dialog_magnetDistance`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-dialog_magnetDistance) [`dialog_noConfirmCancel`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-dialog_noConfirmCancel) [`dialog_startupFocusTab`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-dialog_startupFocusTab)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`disableNativeSpellChecker`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-disableNativeSpellChecker)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | Note: An official integration of the spell and grammar checking functionality for CKEditor 5 is provided by a partner solution, [WProofreader](../../features/spelling-and-grammar-checking.md).A dedicated configuration option to disable the native browser spell checker is unavailable. However, in case of inline, balloon, and balloon block editors it can be done by setting the [`spellcheck`](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/spellcheck) attribute directly on the element where CKEditor should be enabled.Additionally, for all types of editors, including the classic and decoupled ones, you can also call:```js
editor.editing.view.change( writer => {
	writer.setAttribute( 'spellcheck', 'false', editor.editing.view.document.getRoot() );
} );
```                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| [`disableNativeTableHandles`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-disableNativeTableHandles)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | No longer needed. CKEditor 5 does not expose native browser table handles. Column resizing is opt-in instead, so it stays unavailable unless you load [`TableColumnResize`](../../features/tables/tables-resize.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`disableObjectResizing`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-disableObjectResizing)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | No configuration needed. Resizing is opt-in in CKEditor 5, so it stays unavailable unless you load the plugin that provides it, such as [`ImageResize`](../../features/images/images-resizing.md) for images or [`TableColumnResize`](../../features/tables/tables-resize.md) for table columns.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| [`disableReadonlyStyling`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-disableReadonlyStyling)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`disallowedContent`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-disallowedContent)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | See [`config.allowedContent`](#allowedContent). No longer needed as CKEditor 5 removes all unwanted markup that cannot be edited with the editor. You can control this by adding plugins to the editor or via the [General HTML Support feature](../../features/html/general-html-support.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| [`div_wrapTable`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-div_wrapTable)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`docType`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-docType)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | N/A. CKEditor 5 no longer encapsulates the editing area in an `<iframe>`, so the editor is using the same DOCTYPE as the page where it operates.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| [`easyimage_class`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-easyimage_class) [`easyimage_defaultStyle`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-easyimage_defaultStyle) [`easyimage_styles`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-easyimage_styles) [`easyimage_toolbar`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-easyimage_toolbar)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | Refer to the [Images](../../features/images/images-overview.md) feature guides to learn more about image-related features in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| [`editorplaceholder`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-editorplaceholder) [`editorplaceholder_delay`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-editorplaceholder_delay)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | Refer to the [Editor placeholder](../../features/editor-placeholder.md) feature guide to learn more about configuring this feature in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| [`emailProtection`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-emailProtection)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`embed_provider`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-embed_provider)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | Refer to the [Media embed](../../features/media-embed/media-embed.md) feature guide to learn more about media embedding in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| [`emoji_emojiListUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-emoji_emojiListUrl) [`emoji_followingSpace`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-emoji_followingSpace) [`emoji_minChars`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-emoji_minChars)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | You can paste emoji into CKEditor 5 as Unicode content. You can also use the emoji picker of your operating system to insert emoji characters. Use the `Ctrl`+`Cmd`+`Space` keyboard shortcut (macOS) or `Win`+`.` (Windows) or the relevant emoji key on the touch keyboard of your device to open the picker. You can configure the [automatic text transformation feature](../../features/text-transformation.md) to deliver emojis with shortcodes, too.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [`enableContextMenu`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-enableContextMenu)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | N/A. CKEditor 5 does not come with a context menu. A configurable contextual inline toolbar is preferred instead to offer contextual actions for features such as [tables](../../features/tables/tables.md#table-contextual-toolbar) or [images](../../features/images/images-overview.md#image-contextual-toolbar). See also [`toolbar`](../../api/module_core_editor_editorconfig-EditorConfig.md#member-toolbar).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`enableTabKeyTools`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-enableTabKeyTools)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | No configuration needed. CKEditor 5 moves the selection between table cells with `Tab` and `Shift`+`Tab` out of the box, and pressing `Tab` in the last cell adds a new row, just like in CKEditor 4. Refer to the [Accessibility support](../../features/accessibility.md#keystrokes-that-can-be-used-in-a-table-cell) guide for the full list of table keystrokes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`enterMode`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-enterMode)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | N/A. CKEditor 5 always creates a new paragraph (`<p>` element) as specified by [Editor Recommendations - Enter key](http://ckeditor.github.io/editor-recommendations/usability/enter-key.html).You can use `Shift`+`Enter` for creating soft line breaks.If you used this option to build a single-line field, such as a document title or a label, set [`config.root.modelElement`](../../api/module_core_editor_editorconfig-RootConfig.md#member-modelElement) to `'$inlineRoot'`. Such a root accepts inline content only, so pressing `Enter` does not create a new block at all. This is not a general replacement for `enterMode`, which chose the block element to create rather than preventing blocks. Refer to the [Root types](../../getting-started/setup/root-types.md#inline-root) guide for details.                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`entities`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-entities) [`entities_additional`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-entities_additional) [`entities_greek`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-entities_greek) [`entities_latin`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-entities_latin) [`entities_processNumerical`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-entities_processNumerical)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`exportPdf_fileName`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-exportPdf_fileName) [`exportPdf_options`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-exportPdf_options) [`exportPdf_service`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-exportPdf_service) [`exportPdf_stylesheets`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-exportPdf_stylesheets) [`exportPdf_tokenUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-exportPdf_tokenUrl)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | Refer to the [Export to PDF feature](../../features/converters/export-pdf.md) guide to learn more about configuring the HTML to PDF converter in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [`extraAllowedContent`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-extraAllowedContent)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | See [`config.allowedContent`](#allowedContent). You can also achieve this via the [General HTML Support feature](../../features/html/general-html-support.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| [`extraPlugins`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-extraPlugins)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Learn how to [install plugins in CKEditor 5](../../getting-started/setup/configuration.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| [`fileTools_defaultFileName`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-fileTools_defaultFileName) [`fileTools_requestHeaders`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-fileTools_requestHeaders)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | N/A for the default file name. Request headers are configured per upload adapter in CKEditor 5. When using the [Simple upload adapter](../../features/images/image-upload/simple-upload-adapter.md), set them with the [`config.simpleUpload.headers`](../../api/module_upload_uploadconfig-SimpleUploadConfig.md#member-headers) option.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| [`filebrowserBrowseUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-filebrowserBrowseUrl) [`filebrowserFlashBrowseUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-filebrowserFlashBrowseUrl) [`filebrowserFlashUploadUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-filebrowserFlashUploadUrl) [`filebrowserImageBrowseLinkUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-filebrowserImageBrowseLinkUrl) [`filebrowserImageBrowseUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-filebrowserImageBrowseUrl) [`filebrowserImageUploadUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-filebrowserImageUploadUrl) [`filebrowserUploadMethod`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-filebrowserUploadMethod) [`filebrowserUploadUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-filebrowserUploadUrl) [`filebrowserWindowFeatures`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-filebrowserWindowFeatures) [`filebrowserWindowHeight`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-filebrowserWindowHeight) [`filebrowserWindowWidth`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-filebrowserWindowWidth)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | There is no equivalent of the file browser plugin in CKEditor 5 yet. See also [`config.uploadUrl`](#uploadUrl).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| [`fillEmptyBlocks`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-fillEmptyBlocks)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Blocks are always filled in CKEditor 5 because this preserves the intention of the content author (who left such empty lines) in the output data.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| [`find_highlight`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-find_highlight)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | Refer to the [Find and replace](../../features/find-and-replace.md) feature guide.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| [`flashAddEmbedTag`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-flashAddEmbedTag) [`flashConvertOnEdit`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-flashConvertOnEdit) [`flashEmbedTagOnly`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-flashEmbedTagOnly)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`floatSpaceDockedOffsetX`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-floatSpaceDockedOffsetX) [`floatSpaceDockedOffsetY`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-floatSpaceDockedOffsetY) [`floatSpacePinnedOffsetX`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-floatSpacePinnedOffsetX) [`floatSpacePinnedOffsetY`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-floatSpacePinnedOffsetY) [`floatSpacePreferRight`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-floatSpacePreferRight)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`fontSize_defaultLabel`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-fontSize_defaultLabel) [`fontSize_sizes`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-fontSize_sizes) [`fontSize_style`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-fontSize_style) [`font_defaultLabel`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-font_defaultLabel) [`font_names`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-font_names) [`font_style`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-font_style)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | Refer to the [Font family, size, and color](../../features/font.md) feature guide to learn more about font size, family, and color support in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| [`forceEnterMode`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-forceEnterMode)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | N/A. See also [`config.enterMode`](#enterMode).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| [`forcePasteAsPlainText`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-forcePasteAsPlainText)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | N/A. By default, CKEditor 5 removes markup that cannot be edited with the enabled editor plugins. To preserve additional markup, use the [General HTML Support](../../features/html/general-html-support.md) feature.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| [`forceSimpleAmpersand`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-forceSimpleAmpersand)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`format_address`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-format_address) [`format_div`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-format_div) [`format_p`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-format_p) [`format_pre`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-format_pre)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | The [Headings](../../features/headings.md) feature defines the available block formats through the [`config.heading.options`](../../api/module_heading_headingconfig-HeadingConfig.md#member-options) option, which covers paragraphs and headings. Preformatted text comes from the [Code blocks](../../features/code-blocks.md) feature instead. There are no equivalents for the `<address>` and `<div>` formats, so use [General HTML Support](../../features/html/general-html-support.md) to keep them in legacy content.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| [`format_h1`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-format_h1) [`format_h2`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-format_h2) [`format_h3`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-format_h3) [`format_h4`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-format_h4) [`format_h5`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-format_h5) [`format_h6`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-format_h6)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | All headings are configurable via [`config.heading.options`](../../api/module_heading_headingconfig-HeadingConfig.md#member-options). See also the [Headings](../../features/headings.md) feature guide.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| [`format_tags`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-format_tags)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | To enable additional block tags in CKEditor 5, you may use the [General HTML Support feature](../../features/html/general-html-support.md). Alternatively, you must provide a dedicated plugin. See also [`config.allowedContent`](#allowedContent).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`fullPage`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-fullPage)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Available through the [`FullPage`](../../api/module_html-support_fullpage-FullPage.md) API.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| [`grayt_autoStartup`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-grayt_autoStartup)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | An official integration of the spell and grammar checking functionality for CKEditor 5 is provided by a partner solution, [WProofreader](../../features/spelling-and-grammar-checking.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| [`height`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-height)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | [Classic editor](../../examples/builds/classic-editor.md) in CKEditor 5 no longer encapsulates the editing area in an `<iframe>`. This means that you can control the height (and similar options) of the editing area with CSS. For example, you can set the height with `.ck-editor__editable_inline { height:400px; }`.To set the height dynamically (from JavaScript), use the view writer:```js
editor.editing.view.change( writer => {
	writer.setStyle( 'height', '400px', editor.editing.view.document.getRoot() );
} );
```You can also set the height in the configuration. Pass an element definition to the [`config.root.element`](../../api/module_core_editor_editorconfig-RootConfig.md#member-element) option and declare `height`, `min-height`, or `max-height` in its `styles` field. Refer to the [Root types](../../getting-started/setup/root-types.md#applying-classes-and-styles) guide for an example.See also [How to set the height of CKEditor 5 (Classic editor)](https://stackoverflow.com/questions/46559354/how-to-set-the-height-of-ckeditor-5-classic-editor).                                                                                                                                                                   |
| [`htmlEncodeOutput`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-htmlEncodeOutput)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A. CKEditor 5 outputs HTML markup. See also [this StackOverflow question](https://stackoverflow.com/questions/47555667/ckeditor-5-htmlencodeoutput-doesnt-work) and a [dedicated issue](https://github.com/ckeditor/ckeditor5/issues/698).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [`ignoreEmptyParagraph`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-ignoreEmptyParagraph)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | This is the default behavior in CKEditor 5: `editor.getData()` returns an empty string when the content holds nothing but an empty paragraph. To get the markup of the empty paragraph instead, call `editor.getData( { trim: 'none' } )`.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| [`image2_alignClasses`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-image2_alignClasses)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | Available via more powerful [`config.image.styles`](../../api/module_image_imageconfig-ImageConfig.md#member-styles). This also allows for using custom style definitions, not just left, right, and center alignment. See the [Image styles](../../features/images/images-styles.md) feature guide.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`image2_altRequired`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-image2_altRequired) [`image2_captionedClass`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-image2_captionedClass) [`image2_defaultLockRatio`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-image2_defaultLockRatio) [`image2_disableResizer`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-image2_disableResizer) [`image2_maxSize`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-image2_maxSize) [`image2_prefillDimensions`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-image2_prefillDimensions)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | Refer to the [Image](../../features/images/images-overview.md) feature guide to learn more about image-related features and customization options in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| [`imageUploadUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-imageUploadUrl)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | See [`config.uploadUrl`](#uploadUrl).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| [`image_prefillDimensions`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-image_prefillDimensions) [`image_previewText`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-image_previewText) [`image_removeLinkByEmptyURL`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-image_removeLinkByEmptyURL)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | Refer to the [Image](../../features/images/images-overview.md) feature guide to learn more about image-related features and customization options in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| [`indentClasses`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-indentClasses) [`indentOffset`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-indentOffset) [`indentUnit`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-indentUnit)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | Refer to the [Configuring the block indentation](../../features/indent.md#configuring-the-block-indentation-feature) feature guide to learn how to customize the indentation behavior using offsets, units, or classes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| [`jqueryOverrideVal`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-jqueryOverrideVal)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`justifyClasses`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-justifyClasses)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | Refer to the [Text alignment](../../features/text-alignment.md) feature guide.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| [`keystrokes`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-keystrokes)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | You can register keystroke handlers using [`EditingKeystrokeHandler`](../../api/module_core_editingkeystrokehandler-EditingKeystrokeHandler.md). You can find more information and examples in a dedicated [Keystrokes and focus management](../../framework/architecture/ui-library.md#keystrokes-and-focus-management) section.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| [`language`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-language) [`language_list`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-language_list)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | The support for many translations is handled by the translations service. See the [UI language](../../getting-started/setup/ui-language.md) feature guide.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| [`linkDefaultProtocol`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-linkDefaultProtocol)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | [`config.link.defaultProtocol`](../../api/module_link_linkconfig-LinkConfig.md#member-defaultProtocol)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| [`linkJavaScriptLinksAllowed`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-linkJavaScriptLinksAllowed)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | N/A. CKEditor 5 does not filter link addresses in the data, so an `href` that you load or type is preserved and returned by `editor.getData()`, including a `javascript:` one. What the editor does is replace unsafe addresses with `#` in the editing view and in the link preview button. The protocols treated as safe are listed in the [`config.link.allowedProtocols`](../../api/module_link_linkconfig-LinkConfig.md#member-allowedProtocols) option and cover `http`, `https`, `ftp`, `ftps`, and `mailto` by default. Keep sanitizing link addresses in your own pipeline if the output has to be safe.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| [`linkPhoneMsg`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-linkPhoneMsg) [`linkPhoneRegExp`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-linkPhoneRegExp)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | N/A. CKEditor 5 does not validate phone numbers. Note that `tel` is not among the protocols treated as safe by default, so phone links are shown as `#` in the editing view unless you add it to the [`config.link.allowedProtocols`](../../api/module_link_linkconfig-LinkConfig.md#member-allowedProtocols) option. The address itself is kept in the data either way.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| [`linkShowAdvancedTab`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-linkShowAdvancedTab)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | Refer to the [Link](../../features/link.md) feature guide to read about setting custom link attributes.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| [`linkShowTargetTab`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-linkShowTargetTab)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | See [`config.link.addTargetToExternalLinks`](../../api/module_link_linkconfig-LinkConfig.md#member-addTargetToExternalLinks)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [`magicline_color`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-magicline_color) [`magicline_everywhere`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-magicline_everywhere) [`magicline_holdDistance`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-magicline_holdDistance) [`magicline_keystrokeNext`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-magicline_keystrokeNext) [`magicline_keystrokePrevious`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-magicline_keystrokePrevious) [`magicline_tabuList`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-magicline_tabuList) [`magicline_triggerOffset`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-magicline_triggerOffset)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | This functionality is covered by the [`WidgetTypeAround`](../../api/module_widget_widgettypearound_widgettypearound-WidgetTypeAround.md) plugin. It allows users to type around widgets where normally it is impossible to place the caret due to limitations of web browsers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| [`mathJaxClass`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-mathJaxClass) [`mathJaxLib`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-mathJaxLib)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | N/A. Math equation functionality for CKEditor 5 is provided by a partner solution, [MathType](../../features/math-equations.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| [`maximize_historyIntegration`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-maximize_historyIntegration)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`mentions`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-mentions)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Refer to the [Mentions](../../features/mentions.md) feature guide to learn more about smart autocompletion based on user input in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| [`menu_groups`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-menu_groups) [`menu_subMenuDelay`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-menu_subMenuDelay)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | CKEditor 5 does not come with a context menu. A configurable contextual inline toolbar is preferred instead to offer contextual actions for features such as [tables](../../features/tables/tables.md#table-contextual-toolbar) or [images](../../features/images/images-overview.md#image-contextual-toolbar). See also [`toolbar`](../../api/module_core_editor_editorconfig-EditorConfig.md#member-toolbar).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| [`newpage_html`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-newpage_html)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`notification_duration`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-notification_duration)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`observableParent`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-observableParent)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`on`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-on)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | Using the configuration file or setting to define event listeners was a bad practice so support for it was dropped.When creating an editor, a `Promise` is returned. Use `then/catch()` to define a callback when the editor is initialized or fails to start. The promise returns the created editor instance, for example, [`ClassicEditor`](../../api/module_editor-classic_classiceditor-ClassicEditor.md), on which you can listen to its events.Note: The editor instance is not the only object on which events are fired. You can also listen to, for example, [`Document`](../../api/module_engine_model_document-ModelDocument.md) events.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`pasteFilter`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-pasteFilter)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | Not needed as CKEditor 5 always trims the pasted content to match what the available plugins can handle. If you would like to filter the pasted content even further, [report a ticket](https://github.com/ckeditor/ckeditor5/issues/new?labels=type%3Afeature\&template=2-feature-request.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| [`pasteFromWordCleanupFile`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-pasteFromWordCleanupFile) [`pasteFromWordNumberedHeadingToList`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-pasteFromWordNumberedHeadingToList) [`pasteFromWordPromptCleanup`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-pasteFromWordPromptCleanup) [`pasteFromWordRemoveStyles`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-pasteFromWordRemoveStyles) [`pasteFromWord_heuristicsEdgeList`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-pasteFromWord_heuristicsEdgeList) [`pasteFromWord_inlineImages`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-pasteFromWord_inlineImages)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | Refer to the [Paste from Office](../../features/pasting/paste-from-office.md) feature guide to learn more about support for pasting from Microsoft Word in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| [`pasteTools_keepZeroMargins`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-pasteTools_keepZeroMargins)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | Refer to the [Paste from Office](../../features/pasting/paste-from-office.md) and [Paste from Google Docs](../../features/pasting/paste-from-google-docs.md) feature guides to learn more about support for pasting from external applications in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| [`plugins`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-plugins)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | See the [`plugins`](../../api/module_core_editor_editorconfig-EditorConfig.md#member-plugins) configuration option. The way how plugins are enabled in CKEditor 5 has changed in general. Check the articles about [plugins](../../framework/architecture/plugins.md) for more information.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| [`protectedSource`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-protectedSource)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | N/A. CKEditor 5 does not protect content by matching regular expressions. To keep markup that no feature handles, allow it with the [General HTML Support](../../features/html/general-html-support.md) feature instead. For `<script>` tags in legacy content, see the [Enabling script tags for legacy use cases](../../features/html/general-html-support.md#enabling-script-tags-for-legacy-use-cases) section.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`readOnly`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-readOnly)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | See [`editor.isReadOnly`](../../api/module_core_editor_editor-Editor.md#member-isReadOnly) and refer to the [Read-only](../../features/read-only.md) feature guide.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`removeButtons`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-removeButtons)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | N/A. You can achieve a similar effect by setting the [`toolbar`](../../api/module_core_editor_editorconfig-EditorConfig.md#member-toolbar) option with fewer buttons.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| [`removeDialogTabs`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-removeDialogTabs)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`removeFormatAttributes`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-removeFormatAttributes) [`removeFormatTags`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-removeFormatTags)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | Refer to the [Remove formatting](../../features/remove-format.md) feature guide to learn how to remove any text formatting applied with inline HTML elements and CSS styles in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| [`removePlugins`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-removePlugins)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | See [`config.removePlugins`](../../api/module_core_editor_editorconfig-EditorConfig.md#member-removePlugins).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| [`resize_dir`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-resize_dir) [`resize_enabled`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-resize_enabled) [`resize_maxHeight`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-resize_maxHeight) [`resize_maxWidth`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-resize_maxWidth) [`resize_minHeight`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-resize_minHeight) [`resize_minWidth`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-resize_minWidth)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | No longer needed. The editor automatically grows with content. You can also limit its height with `min-height` and `max-height` or set it with `height` if you need. If you want to allow the users to manually resize the editor, you need to implement this behavior by yourself.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`scayt_autoStartup`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_autoStartup) [`scayt_contextCommands`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_contextCommands) [`scayt_contextMenuItemsOrder`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_contextMenuItemsOrder) [`scayt_customDictionaryIds`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_customDictionaryIds) [`scayt_customPunctuation`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_customPunctuation) [`scayt_customerId`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_customerId) [`scayt_disableOptionsStorage`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_disableOptionsStorage) [`scayt_elementsToIgnore`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_elementsToIgnore) [`scayt_handleCheckDirty`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_handleCheckDirty) [`scayt_handleUndoRedo`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_handleUndoRedo) [`scayt_ignoreAllCapsWords`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_ignoreAllCapsWords) [`scayt_ignoreDomainNames`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_ignoreDomainNames) [`scayt_ignoreWordsWithMixedCases`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_ignoreWordsWithMixedCases) [`scayt_ignoreWordsWithNumbers`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_ignoreWordsWithNumbers) [`scayt_inlineModeImmediateMarkup`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_inlineModeImmediateMarkup) [`scayt_maxSuggestions`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_maxSuggestions) [`scayt_minWordLength`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_minWordLength) [`scayt_moreSuggestions`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_moreSuggestions) [`scayt_sLang`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_sLang) [`scayt_serviceHost`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_serviceHost) [`scayt_servicePath`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_servicePath) [`scayt_servicePort`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_servicePort) [`scayt_serviceProtocol`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_serviceProtocol) [`scayt_srcUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_srcUrl) [`scayt_uiTabs`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_uiTabs) [`scayt_userDictionaryName`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-scayt_userDictionaryName) | The spell and grammar checking functionality for CKEditor 5 is provided by a partner solution, [WProofreader](../../features/spelling-and-grammar-checking.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| [`sharedSpaces`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-sharedSpaces)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | N/A.The [decoupled editor](../../api/module_editor-decoupled_decouplededitor-DecoupledEditor.md) allows configuring where to insert the toolbar and the editable element.In addition to that, CKEditor 5 Framework architecture allows for writing a custom editor that contains many editable elements (document roots). See the [multi-root editor example](../../examples/builds/multi-root-editor.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| [`shiftEnterMode`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-shiftEnterMode)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | N/A. CKEditor 5 always creates a new paragraph (`<p>` element) as specified by [Editor Recommendations - Enter key](http://ckeditor.github.io/editor-recommendations/usability/enter-key.html).You can use `Shift`+`Enter` for creating soft line breaks.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| [`shiftLineBreaks`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-shiftLineBreaks)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | N/A. CKEditor 5 always moves line breaks (`<br>` elements) outside inline elements.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`skin`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-skin)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | In CKEditor 5 you can make lots of changes to the interface by changing the default CKEditor theme. See the [Theme customization](../../framework/deep-dive/ui/theme-customization.md) guide.For heavy UI modifications, like integrating CKEditor with a custom UI framework, you need to build a custom editor. See the [Third-party UI](../../framework/deep-dive/ui/external-ui.md) guide.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| [`smiley_columns`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-smiley_columns) [`smiley_descriptions`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-smiley_descriptions) [`smiley_images`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-smiley_images) [`smiley_path`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-smiley_path)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | There is no dedicated smiley plugin in CKEditor 5. However, you can paste the [emoji](#emoji) into the rich-text editor as Unicode content. You can also configure the [automatic text transformation feature](../../features/text-transformation.md) to deliver Unicode emojis with shortcodes. You can use the [special characters](../../features/special-characters.md) feature to input emojis as well.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [`sourceAreaTabSize`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-sourceAreaTabSize)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | There is no configuration option, but the [Source editing](../../features/source-editing/source-editing.md) area can be styled with CSS. Set the `tab-size` property on the `.ck-source-editing-area` selector.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| [`specialChars`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-specialChars)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | Refer to the [Special characters](../../features/special-characters.md) feature guide to learn more about support for inserting special characters in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| [`startupFocus`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-startupFocus)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | There is no configuration option. Call the [`editor.focus()`](../../api/module_core_editor_editor-Editor.md#function-focus) method once the editor is ready, for example in the `then()` callback of [`Editor.create()`](../../api/module_core_editor_editor-Editor.md#static-function-create).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| [`startupMode`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-startupMode)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | CKEditor 5 offers the [Source editing](../../features/source-editing/source-editing.md) feature, which lets users switch to the HTML source of the document. There is no option to open the editor in that mode, so to start in source editing, execute the `sourceEditing` command after the editor is ready.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| [`startupOutlineBlocks`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-startupOutlineBlocks)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | CKEditor 5 offers the [Show blocks](../../features/show-blocks.md) feature, which outlines block elements in the editing area. It is toggled with the `showBlocks` command, so to turn it on when the editor starts, execute that command after the editor is ready.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| [`startupShowBorders`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-startupShowBorders)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | CKEditor 5 renders dashed helper borders for tables and cells whose borders are removed, either with `border: none` or with a zero border width. Tables that CKEditor 4 stored with `border="0"` are therefore covered as well. The helper borders appear only in the editing view and do not change the output data. The behavior is enabled by default and controlled by the [`config.table.showHiddenBorders`](../../api/module_table_tableconfig-TableConfig.md#member-showHiddenBorders) option. Refer to the [Table and cell styling](../../features/tables/tables-styling.md#helper-lines-when-border-style-is-set-to-none) feature guide for details.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| [`stylesSet`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-stylesSet)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | Refer to the [Styles](../../features/style.md) feature guide to learn more about applying styles to the editor content.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| [`stylesheetParser_skipSelectors`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-stylesheetParser_skipSelectors) [`stylesheetParser_validSelectors`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-stylesheetParser_validSelectors)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | N/A. CKEditor 5 does not build the list of styles by parsing a style sheet. Declare the available styles explicitly instead, as described in the [Styles](../../features/style.md) feature guide.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| [`tabIndex`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-tabIndex)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | Pass an element definition to the [`config.root.element`](../../api/module_core_editor_editorconfig-RootConfig.md#member-element) option and declare `tabindex` in its `attributes` field.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| [`tabletools_scopedHeaders`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-tabletools_scopedHeaders)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | CKEditor 5 assigns the `scope` attribute to header cells automatically based on their position, and users can override it in the cell properties balloon. To disable this behavior, set the [`config.table.tableCellProperties.scopedHeaders`](../../api/module_table_tableconfig-TableCellPropertiesConfig.md#member-scopedHeaders) option to `false`. Refer to the [Tables](../../features/tables/tables.md#table-cell-scope) feature guide for details.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| [`tabSpaces`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-tabSpaces)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | N/A. CKEditor 5 does not insert spaces on `Tab`. The key moves the selection or the focus instead, which matches the default CKEditor 4 behavior of `tabSpaces = 0`. Refer to the [Accessibility support](../../features/accessibility.md#user-interface-and-content-navigation-keystrokes) guide for the keystrokes involved.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| [`templates`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-templates) [`templates_files`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-templates_files) [`templates_replaceContent`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-templates_replaceContent)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | Refer to the [Templates](../../features/template.md) guide to learn about support for templates in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| [`title`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-title)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | Use the [`config.root.label`](../../api/module_core_editor_editorconfig-RootConfig.md#member-label) option, which sets the `aria-label` attribute of the editing area and helps assistive technologies tell apart multiple editor instances on a page. In multi-root editors, set it per root with `config.roots.<rootName>.label`.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`toolbar`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-toolbar)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | See [`config.toolbar`](../../api/module_core_editor_editorconfig-EditorConfig.md#member-toolbar). Refer to the [toolbar](../../getting-started/setup/toolbar.md) feature guide to learn more about managing toolbars in CKEditor 5.See also [`config.balloonToolbar`](../../api/module_core_editor_editorconfig-EditorConfig.md#member-balloonToolbar) to define the toolbar of a balloon editor and the [block toolbar](../../getting-started/setup/toolbar.md#block-toolbar) feature.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| [`toolbarCanCollapse`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-toolbarCanCollapse)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | N/A. The user cannot collapse the toolbar manually. For distraction-free editing with the toolbar appearing when you need it, use [inline](../../examples/builds/inline-editor.md), [balloon](../../examples/builds/balloon-editor.md), or [balloon block](../../examples/builds/balloon-block-editor.md) editor.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| [`toolbarGroupCycling`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-toolbarGroupCycling) [`toolbarGroups`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-toolbarGroups)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | N/A. [The toolbar buttons can be grouped](../../api/module_core_editor_editorconfig-EditorConfig.md#member-toolbar) by using `'\|'` as a separator or divided into lines by using `'-'`. Refer to the [toolbar](../../getting-started/setup/toolbar.md) guide to learn more about managing toolbar items behavior in CKEditor 5.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| [`toolbarLocation`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-toolbarLocation)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | N/A. You can achieve this by using the [decoupled editor](../../api/module_editor-decoupled_decouplededitor-DecoupledEditor.md) or writing an editor with a customized UI view, like in this [editor with bottom toolbar](../../examples/framework/bottom-toolbar-editor.md).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| [`toolbarStartupExpanded`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-toolbarStartupExpanded)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | N/A. The toolbar cannot be collapsed in CKEditor 5, so it has no collapsed startup state either. See [`config.toolbarCanCollapse`](#toolbarCanCollapse).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| [`uiColor`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-uiColor)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | CKEditor 5 comes with an idea of much more powerful themes, where you can style almost every aspect of the UI. See the [Theme customization](../../framework/deep-dive/ui/theme-customization.md) guide and [Theme customization example](../../examples/framework/theme-customization.md). Thanks to [CSS variables](../../framework/deep-dive/ui/theme-customization.md#working-with-the-token-layers) rebuilding the editor is not needed to change its styles.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| [`undoStackSize`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-undoStackSize)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | See [`config.typing.undoStep`](../../api/module_typing_typingconfig-TypingConfig.md#member-undoStep).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| [`uploadUrl`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-uploadUrl)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | There are several image upload strategies supported by CKEditor 5. Check out the [Image upload](../../features/images/image-upload/image-upload.md) guide to learn more.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| [`useComputedState`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-useComputedState)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | N/A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| [`widget_keystrokeInsertLineAfter`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-widget_keystrokeInsertLineAfter) [`widget_keystrokeInsertLineBefore`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-widget_keystrokeInsertLineBefore)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | In CKEditor 5 you can insert a new paragraph directly after a widget with `Enter` and directly before a widget – with `Shift` + `Enter`.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| [`width`](https://ckeditor.com/docs/ckeditor4/latest/api/CKEDITOR_config.html#cfg-width)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | [Classic editor](../../examples/builds/classic-editor.md) in CKEditor 5 no longer encapsulates the editing area in an `<iframe>`. This means that you can control the width (and similar options) of the editing area with CSS. For instance, to set the width of any of the editor types, use `.ck-editor__editable_inline { width:400px; }`.To set the width dynamically (from JavaScript), use the view writer:```js
editor.editing.view.change( writer => {
	writer.setStyle( 'width', '400px', editor.editing.view.document.getRoot() );
} );
```You can also set the width in the configuration. Pass an element definition to the [`config.root.element`](../../api/module_core_editor_editorconfig-RootConfig.md#member-element) option and declare `width` in its `styles` field.See also [How to set the height of CKEditor 5 (Classic editor)](https://stackoverflow.com/questions/46559354/how-to-set-the-height-of-ckeditor-5-classic-editor).                                                                                                                                                                                                                                                                                                         |

---

Full index of the CKEditor 5 documentation: [llms.txt](../../../llms.txt)