From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: CSS.supports()
+slug: Web/API/CSS/supports
+tags:
+  - API
+  - CSSOM
+  - Method
+translation_of: Web/API/CSS/supports
+---
+<p>{{APIRef("CSSOM")}}</p>
+
+<p><code><strong>CSS.supports()</strong></code> 静态方法返回一个{{domxref("Boolean")}}值，用来校验浏览器是否支持一个给定的CSS特性。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><em>boolValue</em> = CSS.supports(<em>propertyName</em>, <em>value</em>);
+<em>boolValue</em> = CSS.supports(<em>supportCondition</em>);
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<p>有两种不同的传值形式。第一种用来检验浏览器对于一对“属性-属性值”的支持：</p>
+
+<dl>
+ <dt><em>propertyName</em></dt>
+ <dd>一个包含要检查的CSS属性名称的{{domxref("DOMString")}}。</dd>
+ <dt><em>value</em></dt>
+ <dd>一个包含要检查的CSS属性值的{{domxref("DOMString")}}。</dd>
+</dl>
+
+<p>第二种语法需要一个匹配{{cssxref("@supports")}}条件的参数：</p>
+
+<dl>
+ <dt><em>supportCondition</em></dt>
+ <dd>一个包含了检查条件的{{domxref("DOMString")}}。</dd>
+</dl>
+
+<h2 id="实例">实例</h2>
+
+<pre class="brush: js">result = CSS.supports("text-decoration-style", "blink");
+result = CSS.supports("display", "flex");
+result = CSS.supports('--foo', 'red');
+result = CSS.supports('(--foo: red)');
+result = CSS.supports("<code class="language-css">( <span class="property token">transform-origin</span><span class="punctuation token">:</span> 5% 5% )");
+result = <code class="language-css">CSS.supports("( <span class="property token">transform-style</span><span class="punctuation token">:</span> preserve ) or ( <span class="property token">-moz-transform-style</span><span class="punctuation token">:</span> preserve ) or " +
+                      "( <span class="property token">-o-transform-style</span><span class="punctuation token">:</span> preserve ) or ( <span class="property token">-webkit-transform-style</span><span class="punctuation token">:</span> preserve )" );</code></code>
+//result is true or false
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{ SpecName('CSS3 Conditional', '#the-css-interface', 'CSS.supports()') }}</td>
+   <td>{{ Spec2('CSS3 Conditional') }}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</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</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>28.0 [2]</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{ CompatGeckoDesktop("22") }} [1]</td>
+   <td>{{CompatNo}}</td>
+   <td>12.1</td>
+   <td>9 [2]</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 Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>4.4</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{ CompatGeckoMobile("22") }} [1]</td>
+   <td>{{CompatNo}}</td>
+   <td>12.1</td>
+   <td>9</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1]只有在用户设置<code>layout.css.supports-rule.enabled=true</code>时，Gecko 20和21才会支持这一特性。</p>
+
+<p>[2] 在Chrome ≤ 51 (bug 584683) 和 Safari (bug 154669)中, 即使支持自定义属性，<code>CSS.supports('--foo', 'red')</code> 也会返回false。 您可以使用<code>CSS.supports('(--foo: red)')</code>，作为一种解决方案。</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{cssxref("@supports")}} at-rule 允许以声明的方式，使用相同的功能。</li>
+ <li>{{domxref("CSSSupportsRule")}} CSSOM 类允许在规则中操作{{cssxref("@supports")}}。</li>
+</ul>
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