Basic text styles

The basic styles package provides text formatting features such as bold, italic, underline, strikethrough, subscript, superscript, and code.

All basic text styles can be removed with the remove format feature.

# Demo

This text is bold.

This text is italic.

This text is underlined.

~~This is a strikethrough text~~.

This is an inline code.

These are _{a subscript} and ^{a superscript}.

# Available text styles

Style feature	Command name	Toolbar component name	Output element
`Bold`	`'bold'`	`'bold'`	`<strong>bold</strong>`
`Italic`	`'italic'`	`'italic'`	`<i>italic</i>`
`Underline`	`'underline'`	`'underline'`	`<u>underline</u>`
`Strikethrough`	`'strikethrough'`	`'strikethrough'`	`<s>strikethrough</s>`
`Code`	`'code'`	`'code'`	`<code>code</code>`
`Subscript`	`'subscript'`	`'subscript'`	`<sub>subscript</sub>`
`Superscript`	`'superscript'`	`'superscript'`	`<sup>superscript</sup>`

Bold and Italic are available out–of–the–box in most of the editor builds.

The Code feature provides support for inline code formatting. To create blocks of pre-formatted code with a specific programming language assigned, use the code block feature.

# Supported input

By default, each feature can upcast more than one type of the content. Here’s the full list of elements supported by each feature, either when pasting from the clipboard, loading data on start or using the data API.

Style feature	Supported input elements
`Bold`	`<strong>`, `<b>`, `<* style="font-weight: bold">` (or numeric values that are greater or equal 600)
`Italic`	`<i>`, `<em>`, `<* style="font-style: italic">`
`Underline`	`<u>`, `<* style="text-decoration: underline">`
`Strikethrough`	`<s>`, `<del>`, `<strike>`, `<* style="text-decoration: line-through">`
`Code`	`<code>`, `<* style="word-wrap: break-word">`
`Subscript`	`<sub>`, `<* style="vertical-align: sub">`
`Superscript`	`<sup>`, `<* style="vertical-align: super">`

# Installation

To add the basic styles features to your editor install the @ckeditor/ckeditor5-basic-styles package:

npm install --save @ckeditor/ckeditor5-basic-styles

And add the plugins which you need to your plugin list. Then, simply configure the toolbar items to make the features available in the user interface.

import Bold from '@ckeditor/ckeditor5-basic-styles/src/bold';
import Italic from '@ckeditor/ckeditor5-basic-styles/src/italic';
import Underline from '@ckeditor/ckeditor5-basic-styles/src/underline';
import Strikethrough from '@ckeditor/ckeditor5-basic-styles/src/strikethrough';
import Code from '@ckeditor/ckeditor5-basic-styles/src/code';
import Subscript from '@ckeditor/ckeditor5-basic-styles/src/subscript';
import Superscript from '@ckeditor/ckeditor5-basic-styles/src/superscript';

ClassicEditor
    .create( document.querySelector( '#editor' ), {
        plugins: [ Bold, Italic, Underline, Strikethrough, Code, Subscript, Superscript ],
        toolbar: {
            items: [ 'bold', 'italic', 'underline', 'strikethrough', 'code','subscript', 'superscript'  ]
        }
    } )
    .then( ... )
    .catch( ... );

# Common API

Each style feature registers a command which can be executed from code. For example, the following snippet will apply the bold style to the current selection in the editor:

editor.execute( 'bold' );

We recommend using the official CKEditor 5 inspector for development and debugging. It will give you tons of useful information about the state of the editor such as internal data structures, selection, commands, and many more.

# Contribute

The source code of the feature is available on GitHub in https://github.com/ckeditor/ckeditor5-basic-styles.