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docs/api/marks/underline.md

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+# Underline
+[![Version](https://img.shields.io/npm/v/@tiptap/extension-underline.svg?label=version)](https://www.npmjs.com/package/@tiptap/extension-underline)
+[![Downloads](https://img.shields.io/npm/dm/@tiptap/extension-underline.svg)](https://npmcharts.com/compare/@tiptap/extension-underline?minimal=true)
+
+Use this extension to render text <u>underlined</u>. If you pass `<u>` tags, or text with inline `style` attributes setting `text-decoration: underline` in the editor’s initial content, they all will be rendered accordingly.
+
+Be aware that underlined text in the Internet usually indicates that it’s a clickable link. Don’t confuse your users with underlined text.
+
+::: warning Restrictions
+The extension will generate the corresponding `<u>` HTML tags when reading contents of the `Editor` instance. All text marked underlined, regardless of the method will be normalized to `<u>` HTML tags.
+:::
+
+## Installation
+```bash
+# with npm
+npm install @tiptap/extension-underline
+
+# with Yarn
+yarn add @tiptap/extension-underline
+```
+
+## Settings
+| Option         | Type     | Default | Description                                                           |
+| -------------- | -------- | ------- | --------------------------------------------------------------------- |
+| HTMLAttributes | `Object` | `{}`    | Custom HTML attributes that should be added to the rendered HTML tag. |
+
+## Commands
+| Command         | Parameters | Description              |
+| --------------- | ---------- | ------------------------ |
+| setUnderline    | —          | Mark text as underlined. |
+| toggleUnderline | —          | Toggle underline mark.   |
+| unsetUnderline  | —          | Remove underline mark.   |
+
+## Keyboard shortcuts
+* Windows/Linux: `Control`&nbsp;`U`
+* macOS: `Cmd`&nbsp;`U`
+
+## Source code
+[packages/extension-underline/](https://github.com/ueberdosis/tiptap/blob/main/packages/extension-underline/)
+
+## Usage
+<tiptap-demo name="Marks/Underline"></tiptap-demo>