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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>
{{Compat("api.CSS.supports")}}
<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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