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+---
+title: CSS
+slug: Web/API/CSS
+tags:
+  - API
+  - CSSOM
+  - Interface
+  - NeedsTranslation
+  - Painting
+  - Reference
+  - TopicStub
+translation_of: Web/API/CSS
+---
+<div>{{APIRef("CSSOM")}}</div>
+
+<p>The <code><strong>CSS</strong></code> interface holds useful CSS-related methods. No objects with this interface are implemented: it contains only static methods and is therefore a utilitarian interface.</p>
+
+<h2 id="Properties">Properties</h2>
+
+<p><em>The CSS interface is a utility interface and no object of this type can be created: only static properties are defined on it.</em></p>
+
+<h3 id="Static_properties">Static properties</h3>
+
+<dl>
+ <dt>{{DOMxRef("CSS.paintWorklet")}} {{Experimental_Inline}}{{SecureContext_Inline}}</dt>
+ <dd>Provides access to the Worklet responsible for all the classes related to painting.</dd>
+</dl>
+
+<h2 id="Methods">Methods</h2>
+
+<p><em>The CSS interface is a utility interface and no object of this type can be created: only static methods are defined on it.</em></p>
+
+<h3 id="Static_methods">Static methods</h3>
+
+<p><em>No inherited static methods</em>.</p>
+
+<dl>
+ <dt>{{DOMxRef("CSS.registerProperty()")}}</dt>
+ <dd>Registers {{cssxref('--*', 'custom properties')}}, allowing for property type checking, default values, and properties that do or do not inherit their value.</dd>
+ <dt>{{DOMxRef("CSS.supports()")}}</dt>
+ <dd>Returns a {{JSxRef("Boolean")}} indicating if the pair <em>property-value</em>, or the condition, given in parameter is supported.</dd>
+ <dt>{{DOMxRef("CSS.escape()")}}</dt>
+ <dd>Can be used to escape a string mostly for use as part of a CSS selector.</dd>
+ <dt>{{DOMxRef("CSS.factory_functions", 'CSS factory functions')}}</dt>
+ <dd>Can be used to return a new <code><a href="/en-US/docs/Web/API/CSSUnitValue">CSSUnitValue</a></code> with a value of the parameter number of the units of the name of the factory function method used.</dd>
+ <dd>
+ <pre class="notranslate">CSS.em(3) // CSSUnitValue {value: 3, unit: "em"}</pre>
+ </dd>
+</dl>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('CSS Painting API','#dom-css-paintworklet','paintWorklet')}}</td>
+   <td>{{Spec2('CSS Painting API')}}</td>
+   <td>Adds the <code>paintWorklet</code> static property.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSSOM', '#the-css.escape()-method', 'CSS')}}</td>
+   <td>{{Spec2('CSSOM')}}</td>
+   <td>Adds the <code>escape()</code> static method.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('CSS3 Conditional', '#the-css-interface', 'CSS')}}</td>
+   <td>{{Spec2('CSS3 Conditional')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+
+
+<p>{{Compat("api.CSS", 1)}}</p>
+
+<h2 id="See_Also">See Also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Components.utils.importGlobalProperties">Components.utils.importGlobalProperties</a></li>
+</ul>