Revision 337381 of CSSSupportsRule

<p>{{ CSSOMRef() }}</p>
<p>{{ SeeCompatTable() }}</p>
<p>The <strong><code>CSSSupportsRule</code></strong> interface describes an object representing a single CSS {{ cssxref("@supports") }} <a href="/en-US/docs/CSS/At-rule" title="/en-US/docs/CSS/At-rule">at-rule</a>. It implements the {{ domxref("CSSConditionRule") }} interface, and therefore the {{domxref("CSSRule")}} and {{domxref("CSSGroupingRule")}} interfaces with a type value of <code>12</code> (<code>CSSRule.SUPPORTS_RULE</code>).</p>
<h2 id="Properties" name="Properties">Syntax</h2>
<p>The syntax is described using the <a href="https://dev.w3.org/2006/webapi/WebIDL/" title="https://dev.w3.org/2006/webapi/WebIDL/">WebIDL</a> format.</p>
<pre>
interface CSSSupportsRule : CSSConditionRule {
}
</pre>
<h2 id="Properties" name="Properties">Properties</h2>
<p>As a {{ domxref("CSSConditionRule") }} and therefore a {{ domxref("CSSRule") }} and a {{domxref("CSSGroupingRule")}}, <code>CSSSupportsRule</code> also implements the properties of these interfaces. It has no specific properties.</p>
<h2 id="Methods" name="Methods">Methods</h2>
<p>As a {{ domxref("CSSConditionRule") }} and therefore a {{ domxref("CSSRule") }}and a {{domxref("CSSGroupingRule")}}, <code>CSSSupportsRule</code> also implements the methods of that interface. It has no specific methods.</p>
<dl>
</dl>
<h2 id="Specification" name="Specification">Specification</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-csssupportsrule-interface', 'CSSSupportsRule') }}</td>
      <td>{{ Spec2('CSS3 Conditional') }}</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>Firefox (Gecko)</th>
        <th>Internet Explorer</th>
        <th>Opera</th>
        <th>Safari (WebKit)</th>
      </tr>
      <tr>
        <td>Basic support</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoDesktop("17") }} [1][2]</td>
        <td>{{ CompatNo() }}</td>
        <td>12.10</td>
        <td>{{ CompatNo() }}</td>
      </tr>
    </tbody>
  </table>
</div>
<div id="compat-mobile">
  <table class="compat-table">
    <tbody>
      <tr>
        <th>Feature</th>
        <th>Android</th>
        <th>Firefox Mobile (Gecko)</th>
        <th>IE&nbsp;Phone</th>
        <th>Opera Mobile</th>
        <th>Safari Mobile</th>
      </tr>
      <tr>
        <td>Basic support</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatGeckoMobile("17") }} [1][2]</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
        <td>{{ CompatNo() }}</td>
      </tr>
    </tbody>
  </table>
</div>
<p>[1] As prefixing this at-rule has no sense, the <code>CSSSupportsRule</code> is only supported if the user enables it by setting the config value <code>layout.css.supports-rule.enable</code> to true.</p>
<p>[2] From Firefox 17 to Firefox 19 included, <code>CSSSupportsRule</code> derived directly from <code>CSSRule</code> and the methods and properties now defined at the <code>CSSConditionRule</code> level where defined in <code>CSSSupportsRule</code>. The draft specification changed and Firefox 20 was updated.</p>
<h2 id="See_also">See also</h2>
<ul>
  <li>{{CSSOM}}</li>
  <li>{{ cssxref("@supports") }}</li>
</ul>