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+---
+title: mask-mode
+slug: Web/CSS/mask-mode
+translation_of: Web/CSS/mask-mode
+---
+<div>{{CSSRef}}{{SeeCompatTable}}</div>
+
+<p><strong><code>mask-mode</code></strong><a href="https://developer.mozilla.org/en-US/docs/Web/CSS" rel="nofollow noopener noreferrer">CSS</a>属性指示由{{cssxref("mask-image")}} 指向的遮罩被视为亮度或阿尔法遮罩。</p>
+
+<pre class="brush:css no-line-numbers">/* 关取值的键字 */
+mask-mode: alpha;
+mask-mode: luminance;
+mask-mode: match-source;
+
+/* 多个类型的值 */
+mask-mode: alpha, match-source;
+
+/* 全局变量的值 */
+mask-mode: inherit;
+mask-mode: initial;
+mask-mode: unset;
+</pre>
+
+<p>{{cssinfo}}</p>
+
+<h2 id="语法">语法</h2>
+
+<p>下面列出 <code>mask-mode</code> 的一个或多个关键字值，以逗号分隔。</p>
+
+<h3 id="Values">Values</h3>
+
+<dl>
+ <dt><code>alpha</code></dt>
+ <dd>此关键字指示应使用掩码层图像的透明度（阿尔法通道）值作为掩码值。</dd>
+ <dt><code>luminance</code></dt>
+ <dd>此关键字指示掩膜层图像的亮度值应用作掩码值。</dd>
+ <dt><code>match-source</code></dt>
+ <dd>
+ <p>If the {{cssxref("mask-image")}} property is of type <code>&lt;mask-source&gt;</code>, the luminance values of the mask layer image should be used as the mask values.</p>
+
+ <p>If it is of type {{cssxref("&lt;image&gt;")}}, the alpha values of the mask layer image should be used as the mask values.</p>
+
+ <p>如果{{cssxref("mask-image")}}属性是<code>&lt;mask-source&gt;</code>类型，掩模层图像的亮度值会被作为掩模值。</p>
+
+ <p>如果它是类型{{cssxref("&lt;image&gt;")}}，掩码层图像的alpha值应用作掩码值。</p>
+ </dd>
+</dl>
+
+<h3 id="正式语法">正式语法</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="CSS">CSS</h3>
+
+<pre class="brush: css; highlight[6]">#masked {
+  width: 227px;
+  height: 200px;
+  background: blue linear-gradient(red, blue);
+  mask-image: url(https://mdn.mozillademos.org/files/12668/MDN.svg);
+  mask-mode: alpha; /* Can be changed in the live sample */
+}
+</pre>
+
+<div class="hidden">
+<h3 id="HTML">HTML</h3>
+
+<pre class="brush: html">&lt;div id="masked"&gt;
+&lt;/div&gt;
+&lt;select id="maskMode"&gt;
+  &lt;option value="alpha"&gt;alpha&lt;/option&gt;
+  &lt;option value="luminance"&gt;luminance&lt;/option&gt;
+  &lt;option value="match-source"&gt;match-source&lt;/option&gt;
+&lt;/select&gt;
+</pre>
+
+<h3 id="JavaScript">JavaScript</h3>
+
+<pre class="brush: js">var maskMode = document.getElementById("maskMode");
+maskMode.addEventListener("change", function (evt) {
+  document.getElementById("masked").style.maskMode = evt.target.value;
+});
+</pre>
+</div>
+
+<h3 id="结果">结果</h3>
+
+<p>{{EmbedLiveSample("Example", 240, 240)}}</p>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">说明</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName("CSS Masks", "#the-mask-mode", "mask-mode")}}</td>
+   <td>{{Spec2("CSS Masks")}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("css.properties.mask-mode")}}</p>