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<!-- NOTE: README.md is generated from src/README.md -->
# @codemirror/lang-html [](https://www.npmjs.org/package/@codemirror/lang-html)
[ [**WEBSITE**](https://codemirror.net/) | [**ISSUES**](https://github.com/codemirror/dev/issues) | [**FORUM**](https://discuss.codemirror.net/c/next/) | [**CHANGELOG**](https://github.com/codemirror/lang-html/blob/main/CHANGELOG.md) ]
This package implements HTML language support for the
[CodeMirror](https://codemirror.net/) code editor.
The [project page](https://codemirror.net/) has more information, a
number of [examples](https://codemirror.net/examples/) and the
[documentation](https://codemirror.net/docs/).
This code is released under an
[MIT license](https://github.com/codemirror/lang-html/tree/main/LICENSE).
We aim to be an inclusive, welcoming community. To make that explicit,
we have a [code of
conduct](http://contributor-covenant.org/version/1/1/0/) that applies
to communication around the project.
## API Reference
<dl>
<dt id="user-content-html">
<code><strong><a href="#user-content-html">html</a></strong>(<a id="user-content-html^config" href="#user-content-html^config">config</a>⁠?: {selfClosingTags⁠?: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean">boolean</a>} = {}) → <a href="https://codemirror.net/docs/ref#language.LanguageSupport">LanguageSupport</a></code></dt>
<dd><p>Language support for HTML, including
<a href="#user-content-htmlcompletion"><code>htmlCompletion</code></a> and JavaScript and
CSS support extensions.</p>
<dl><dt id="user-content-html^config">
<code><strong><a href="#user-content-html^config">config</a></strong></code></dt>
<dd><dl><dt id="user-content-html^config.matchclosingtags">
<code><strong><a href="#user-content-html^config.matchclosingtags">matchClosingTags</a></strong>⁠?: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean">boolean</a></code></dt>
<dd><p>By default, the syntax tree will highlight mismatched closing
tags. Set this to <code>false</code> to turn that off (for example when you
expect to only be parsing a fragment of HTML text, not a full
document).</p>
</dd><dt id="user-content-html^config.autoclosetags">
<code><strong><a href="#user-content-html^config.autoclosetags">autoCloseTags</a></strong>⁠?: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean">boolean</a></code></dt>
<dd><p>Determines whether <a href="#user-content-autoclosetags"><code>autoCloseTags</code></a>
is included in the support extensions. Defaults to true.</p>
</dd><dt id="user-content-html^config.extratags">
<code><strong><a href="#user-content-html^config.extratags">extraTags</a></strong>⁠?: <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeystype">Record</a><<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>, <a href="#user-content-tagspec">TagSpec</a>></code></dt>
<dd><p>Add additional tags that can be completed.</p>
</dd><dt id="user-content-html^config.extraglobalattributes">
<code><strong><a href="#user-content-html^config.extraglobalattributes">extraGlobalAttributes</a></strong>⁠?: <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeystype">Record</a><<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>, readonly <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>[] | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/null">null</a>></code></dt>
<dd><p>Add additional completable attributes to all tags.</p>
</dd><dt id="user-content-html^config.nestedlanguages">
<code><strong><a href="#user-content-html^config.nestedlanguages">nestedLanguages</a></strong>⁠?: {tag: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>, attrs⁠?: fn(<a id="user-content-html^config.nestedlanguages.attrs^attrs" href="#user-content-html^config.nestedlanguages.attrs^attrs">attrs</a>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object">Object</a><<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>>) → <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean">boolean</a>, parser: <a href="https://lezer.codemirror.net/docs/ref/#common.Parser">Parser</a>}[]</code></dt>
<dd><p>Register additional languages to parse the content of specific
tags. If given, <code>attrs</code> should be a function that, given an
object representing the tag's attributes, returns <code>true</code> if this
language applies.</p>
</dd><dt id="user-content-html^config.nestedattributes">
<code><strong><a href="#user-content-html^config.nestedattributes">nestedAttributes</a></strong>⁠?: {name: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>, tagName⁠?: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>, parser: <a href="https://lezer.codemirror.net/docs/ref/#common.Parser">Parser</a>}[]</code></dt>
<dd><p>Register additional languages to parse attribute values with.</p>
</dd></dl></dd></dl></dd>
<dt id="user-content-htmllanguage">
<code><strong><a href="#user-content-htmllanguage">htmlLanguage</a></strong>: <a href="https://codemirror.net/docs/ref#language.LRLanguage">LRLanguage</a></code></dt>
<dd><p>A language provider based on the <a href="https://github.com/lezer-parser/html">Lezer HTML
parser</a>, extended with the
JavaScript and CSS parsers to parse the content of <code><script></code> and
<code><style></code> tags.</p>
</dd>
<dt id="user-content-htmlcompletionsource">
<code><strong><a href="#user-content-htmlcompletionsource">htmlCompletionSource</a></strong>(<a id="user-content-htmlcompletionsource^context" href="#user-content-htmlcompletionsource^context">context</a>: <a href="https://codemirror.net/docs/ref#autocomplete.CompletionContext">CompletionContext</a>) → <a href="https://codemirror.net/docs/ref#autocomplete.CompletionResult">CompletionResult</a> | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/null">null</a></code></dt>
<dd><p>HTML tag completion. Opens and closes tags and attributes in a
context-aware way.</p>
</dd>
<dt id="user-content-tagspec">
<h4>
<code>interface</code>
<a href="#user-content-tagspec">TagSpec</a></h4>
</dt>
<dd><p>Type used to specify tags to complete.</p>
<dl><dt id="user-content-tagspec.attrs">
<code><strong><a href="#user-content-tagspec.attrs">attrs</a></strong>⁠?: <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeystype">Record</a><<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>, readonly <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>[] | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/null">null</a>></code></dt>
<dd><p>Define tag-specific attributes. Property names are attribute
names, and property values can be null to indicate free-form
attributes, or a list of strings for suggested attribute values.</p>
</dd><dt id="user-content-tagspec.globalattrs">
<code><strong><a href="#user-content-tagspec.globalattrs">globalAttrs</a></strong>⁠?: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Boolean">boolean</a></code></dt>
<dd><p>When set to false, don't complete global attributes on this tag.</p>
</dd><dt id="user-content-tagspec.children">
<code><strong><a href="#user-content-tagspec.children">children</a></strong>⁠?: readonly <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>[]</code></dt>
<dd><p>Can be used to specify a list of child tags that are valid
inside this tag. The default is to allow any tag.</p>
</dd></dl>
</dd>
<dt id="user-content-htmlcompletionsourcewith">
<code><strong><a href="#user-content-htmlcompletionsourcewith">htmlCompletionSourceWith</a></strong>(<a id="user-content-htmlcompletionsourcewith^config" href="#user-content-htmlcompletionsourcewith^config">config</a>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object">Object</a>) → fn(<a id="user-content-htmlcompletionsourcewith^returns^context" href="#user-content-htmlcompletionsourcewith^returns^context">context</a>: <a href="https://codemirror.net/docs/ref#autocomplete.CompletionContext">CompletionContext</a>) → <a href="https://codemirror.net/docs/ref#autocomplete.CompletionResult">CompletionResult</a> | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/null">null</a></code></dt>
<dd><p>Create a completion source for HTML extended with additional tags
or attributes.</p>
<dl><dt id="user-content-htmlcompletionsourcewith^config">
<code><strong><a href="#user-content-htmlcompletionsourcewith^config">config</a></strong></code></dt>
<dd><dl><dt id="user-content-htmlcompletionsourcewith^config.extratags">
<code><strong><a href="#user-content-htmlcompletionsourcewith^config.extratags">extraTags</a></strong>⁠?: <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeystype">Record</a><<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>, <a href="#user-content-tagspec">TagSpec</a>></code></dt>
<dd><p>Define extra tag names to complete.</p>
</dd><dt id="user-content-htmlcompletionsourcewith^config.extraglobalattributes">
<code><strong><a href="#user-content-htmlcompletionsourcewith^config.extraglobalattributes">extraGlobalAttributes</a></strong>⁠?: <a href="https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeystype">Record</a><<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>, readonly <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String">string</a>[] | <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/null">null</a>></code></dt>
<dd><p>Add global attributes that are available on all tags.</p>
</dd></dl></dd></dl></dd>
<dt id="user-content-autoclosetags">
<code><strong><a href="#user-content-autoclosetags">autoCloseTags</a></strong>: <a href="https://codemirror.net/docs/ref#state.Extension">Extension</a></code></dt>
<dd><p>Extension that will automatically insert close tags when a <code>></code> or
<code>/</code> is typed.</p>
</dd>
</dl>
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