--- title: CSSStyleSheet slug: Web/API/CSSStyleSheet tags: - API - CSSOM - NeedsTranslation - Reference - TopicStub translation_of: Web/API/CSSStyleSheet --- <div>{{APIRef("CSSOM")}}</div> <p>The <strong><code>CSSStyleSheet</code></strong> interface represents a single <a href="/en-US/docs/Web/CSS">CSS</a> style sheet. It inherits properties and methods from its parent, {{domxref("StyleSheet")}}.</p> <p>A style sheet consists of <em>{{domxref("CSSRule", "rules", "", 1)}}</em>, such as <em>{{domxref("CSSStyleRule", "style rules", "", 1)}}</em><em> </em>("<code>h1,h2 { font-size: 16pt }"</code>), various <em>at-rules</em> (<code>@import</code>, <code>@media</code>, ...), etc. This interface lets you inspect and modify the list of rules in the stylesheet.</p> <p>See the {{anch("Notes")}} section for the various ways a CSSStyleSheet object can be obtained.</p> <h2 id="Properties">Properties</h2> <p><em>Inherits properties from its parent, {{domxref("StyleSheet")}}.</em></p> <dl> <dt id="cssRules">{{domxref("CSSStyleSheet.cssRules")}}</dt> <dd>Returns a live {{domxref("CSSRuleList")}}, listing the {{domxref("CSSRule")}} objects in the style sheet.<br> This is normally used to access individual rules like this:<br> <code> styleSheet.cssRules[i] // where i = 0..cssRules.length-1</code><br> To add or remove items in <code>cssRules</code>, use the <code>CSSStyleSheet</code>'s <code>deleteRule()</code> and <code>insertRule()</code> methods, described below.</dd> <dt id="ownerRule">{{domxref("CSSStyleSheet.ownerRule")}}</dt> <dd>If this style sheet is imported into the document using an {{cssxref("@import")}} rule, the <code>ownerRule</code> property will return that {{domxref("CSSImportRule")}}, otherwise it returns <code>null</code>.</dd> </dl> <h2 id="Methods">Methods</h2> <p><em>Inherits methods from its parent, {{domxref("Stylesheet")}}.</em></p> <dl> <dt id="deleteRule">{{domxref("CSSStyleSheet.deleteRule()")}}</dt> <dd>Deletes a rule at the specified position from the style sheet.</dd> <dt id="insertRule">{{domxref("CSSStyleSheet.insertRule()")}}</dt> <dd>Inserts a new rule at the specified position in the style sheet, given the textual representation of the rule.</dd> </dl> <h2 id="Notes">Notes</h2> <p>In some browsers, if a stylesheet is loaded from a different domain, calling <code>cssRules</code> results in <code>SecurityError</code>.</p> <p>A stylesheet is associated with at most one {{domxref("Document")}}, which it applies to (unless {{domxref("StyleSheet.disabled", "disabled", "", 1)}}). A list of <code>CSSStyleSheet</code> objects for a given document can be obtained using the {{domxref("document.styleSheets")}} property. A specific style sheet can also be accessed from its <em>owner</em> object (<code>Node</code> or <code>CSSImportRule</code>), if any.</p> <p>A <code>CSSStyleSheet</code> object is created and inserted into the document's <code>styleSheets</code> list automatically by the browser, when a style sheet is loaded for a document. As the {{domxref("document.styleSheets")}} list cannot be modified directly, there's no useful way to create a new <code>CSSStyleSheet</code> object manually (although <a href="http://tabatkins.github.io/specs/construct-stylesheets/">Constructable Stylesheet Objects</a> might get added to the Web APIs at some point). To create a new stylesheet, insert a {{HTMLElement("style")}} or {{HTMLElement("link")}} element into the document.</p> <p>A (possibly incomplete) list of ways a style sheet can be associated with a document follows:</p> <table class="standard-table"> <thead> <tr> <th scope="col">Reason for the style sheet to be associated with the document</th> <th scope="col">Appears in <code>document.<br> styleSheets</code> list</th> <th scope="col">Getting the owner element/rule given the style sheet object</th> <th scope="col">The interface for the owner object</th> <th scope="col">Getting the CSSStyleSheet object from the owner</th> </tr> </thead> <tbody> <tr> <td>{{HTMLElement("style")}} and {{HTMLElement("link")}} elements in the document</td> <td>Yes</td> <td>{{domxref("StyleSheet.ownerNode", ".ownerNode")}}</td> <td>{{domxref("HTMLLinkElement")}},<br> {{domxref("HTMLStyleElement")}},<br> or {{domxref("SVGStyleElement")}}</td> <td>{{domxref("LinkStyle.sheet", ".sheet")}}</td> </tr> <tr> <td>CSS {{cssxref("@import")}} rule in other style sheets applied to the document</td> <td>Yes</td> <td>{{domxref("CSSStyleSheet.ownerRule", ".ownerRule")}}</td> <td>{{domxref("CSSImportRule")}}</td> <td>{{domxref("CSSImportRule.styleSheet", ".styleSheet")}}</td> </tr> <tr> <td><code><?xml-stylesheet ?></code> processing instruction in the (non-HTML) document</td> <td>Yes</td> <td>{{domxref("StyleSheet.ownerNode", ".ownerNode")}}</td> <td>{{domxref("ProcessingInstruction")}}</td> <td>{{domxref("LinkStyle.sheet", ".sheet")}}</td> </tr> <tr> <td>HTTP Link Header</td> <td>Yes</td> <td><em>N/A</em></td> <td>N/A</td> <td>N/A</td> </tr> <tr> <td>User agent (default) style sheets</td> <td>No</td> <td>N/A</td> <td>N/A</td> <td>N/A</td> </tr> </tbody> </table> <h2 id="Specifications">Specifications</h2> <table class="standard-table"> <tbody> <tr> <th>Specification</th> <th>Status</th> <th>Comment</th> </tr> <tr> <td>{{SpecName("CSSOM", "#cssstylesheet", 'CSSStyleSheet')}}</td> <td>{{Spec2("CSSOM")}}</td> <td> </td> </tr> <tr> <td>{{SpecName("DOM2 Style", "css.html#CSS-CSSStyleSheet", "CSSStyleSheet")}}</td> <td>{{Spec2("DOM2 Style")}}</td> <td>Initial definition</td> </tr> </tbody> </table> <h2 id="Browser_compatibility">Browser compatibility</h2> <p>{{CompatibilityTable}}</p> <div id="compat-desktop"> <table class="compat-table"> <tbody> <tr> <th>Feature</th> <th>Chrome</th> <th>Edge</th> <th>Firefox (Gecko)</th> <th>Internet Explorer</th> <th>Opera</th> <th>Safari (WebKit)</th> </tr> <tr> <td>Basic support</td> <td>{{CompatVersionUnknown}}</td> <td>{{CompatVersionUnknown}}</td> <td>{{CompatVersionUnknown}}</td> <td>9.0</td> <td>{{CompatVersionUnknown}}</td> <td>{{CompatVersionUnknown}}</td> </tr> </tbody> </table> </div> <div id="compat-mobile"> <table class="compat-table"> <tbody> <tr> <th>Feature</th> <th>Android</th> <th>Edge</th> <th>Firefox Mobile (Gecko)</th> <th>IE Phone</th> <th>Opera Mobile</th> <th>Safari Mobile</th> </tr> <tr> <td>Basic support</td> <td>{{CompatVersionUnknown}}</td> <td>{{CompatVersionUnknown}}</td> <td>{{CompatVersionUnknown}}</td> <td>{{CompatVersionUnknown}}</td> <td>{{CompatVersionUnknown}}</td> <td>{{CompatVersionUnknown}}</td> </tr> </tbody> </table> </div> <h2 id="See_also">See also</h2> <ul> <li><a href="/en-US/docs/Web/API/CSS_Object_Model/Using_dynamic_styling_information">Using dynamic styling information</a></li> </ul>