# html-support/schemadefinitions

module

<a id="constants">

## Constants

<a id="constant-defaultConfig">

### `defaultConfig: object`

Skipped elements due to HTML deprecation:

* noframes (not sure if we should provide support for this element. CKE4 is not supporting frameset and frame, but it will unpack  to , so there may be some content loss. Although using noframes as a standalone element seems invalid)

* keygen (this one is also empty)

* applet (support is limited mostly to old IE)

* basefont (this one is also empty)

* isindex (basically no support for modern browsers at all)

Skipped elements due to lack empty element support:

* hr
* area
* br
* command
* map
* wbr
* colgroup -> col

Skipped elements due to complexity:

* datalist with option elements used as a data source for input\[list] element

Skipped elements as they are handled as an object content:

* track
* source
* option
* param
* optgroup

Skipped full page HTML elements:

* body
* html
* title
* head
* meta
* link
* etc...

Skipped hidden elements: noscript

When adding elements to this list, update the feature guide listing, too.

[See source](https://github.com/ckeditor/ckeditor5/blob/master/packages/ckeditor5-html-support/src/schemadefinitions.ts#L57)

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Full index of the CKEditor 5 API reference: [llms.txt](llms.txt)