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+---
+title: CSSConditionRule
+slug: Web/API/CSSConditionRule
+translation_of: Web/API/CSSConditionRule
+---
+<p>{{ APIRef("CSSOM") }}</p>
+
+<p> </p>
+
+<p> </p>
+
+<p><strong>CSSConditionRule</strong> 对象表示单个条件 CSS 规则, 由条件和语句块组成。继承至 {{domxref("CSSGroupingRule")}}.</p>
+
+<p>从它派生的两个对象 : {{domxref("CSSMediaRule")}} and {{domxref("CSSSupportsRule")}}.</p>
+
+<h2 id="Syntax">Syntax</h2>
+
+<p>The syntax is described using the <a class="external" href="http://dev.w3.org/2006/webapi/WebIDL/" title="http://dev.w3.org/2006/webapi/WebIDL/">WebIDL</a> format.</p>
+
+<pre>interface CSSConditionRule : CSSGroupingRule {
+    attribute DOMString conditionText;
+}
+</pre>
+
+<h2 id="Properties">Properties</h2>
+
+<p>The <code>CSSConditionRule</code> derives from {{domxref("CSSRule")}}, {{domxref("CSSGroupingRule")}} and inherits all properties of these classes. It has one specific property:</p>
+
+<dl>
+ <dt>{{domxref("CSSConditionRule.conditionText")}}</dt>
+ <dd>Represents the text of the condition of the rule.</dd>
+</dl>
+
+<h2 id="Methods">Methods</h2>
+
+<p>The <code>CSSConditionRule</code> derives from {{domxref("CSSRule")}}, {{domxref("CSSGroupingRule")}} and inherits all methods of these classes. It has no specific property of its own.</p>
+
+<h2 id="Specification" name="Specification">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('CSS3 Conditional', '#the-cssconditionrule-interface', 'CSSConditionRule') }}</td>
+   <td>{{ Spec2('CSS3 Conditional') }}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+
+
+<p>{{Compat("api.CSSConditionRule")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en/DOM/Using_dynamic_styling_information" title="en/DOM/Using_dynamic_styling_information">Using dynamic styling information</a></li>
+</ul>