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+---
+title: mask-border-width
+slug: Web/CSS/mask-border-width
+translation_of: Web/CSS/mask-border-width
+---
+<div>{{CSSRef}}{{SeeCompatTable}}</div>
+
+<div><code><strong>mask-border-width</strong></code> <a href="/zh-CN/docs/Web/CSS">CSS</a> 属性设置元素的 <a href="/zh-CN/docs/Web/CSS/mask-border">mask border</a>的宽度</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush:css no-line-numbers">/* Keyword value */
+mask-border-width: auto;
+
+/* &lt;length&gt; value */
+mask-border-width: 1rem;
+
+/* &lt;percentage&gt; value */
+mask-border-width: 25%;
+
+/* &lt;number&gt; value */
+mask-border-width: 3;
+
+/* vertical | horizontal */
+mask-border-width: 2em 3em;
+
+/* top | horizontal | bottom */
+mask-border-width: 5% 15% 10%;
+
+/* top | right | bottom | left */
+mask-border-width: 5% 2em 10% auto;
+
+/* Global values */
+mask-border-width: inherit;
+mask-border-width: initial;
+mask-border-width: unset;
+</pre>
+
+<p>可以使用从下面的值列表中选择的一个，两个，三个或四个值来指定<code>mask-border-width</code>属性。</p>
+
+<ul>
+ <li>指定一个值时，即对应四条边的宽度；</li>
+ <li>指定两个值时，第一个值对应上下边框的宽度，第二个值对应左右边框的宽度；</li>
+ <li>指定三个值时，第一个值对应上边框的宽度，第二个值对应左右边框的宽度，第三个值对应底部边框的宽度；</li>
+ <li>指定四个值时，按顺时针方向，分别对应上，右，下，左边框的宽度。</li>
+</ul>
+
+<h3 id="值">值</h3>
+
+<dl>
+ <dt><code>&lt;length-percentage&gt;</code></dt>
+ <dd><code>mask</code>边框宽度指定一个值或者百分比，设定百分比时，是相对于<code>mask</code>的长度和宽度。不能为负数。</dd>
+ <dt><font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);">&lt;number&gt;</span></font></dt>
+ <dd>mask边框宽度为元素<code>border-width</code>的倍数。不能为负数。</dd>
+ <dt><code>auto</code></dt>
+ <dd>使<code>mask-border</code>的宽度等于相应<a href="https://developer.mozilla.org/en-US/docs/Web/CSS/mask-border-slice" title="The mask-border-slice CSS property divides the image set by mask-border-source into regions. These regions are used to form the components of an element's mask border."><code>mask-border-slice</code></a>的固有宽度或高度（以适用者为准），如果图像没有所需的固有尺寸，则使用相应的边框宽度。</dd>
+</dl>
+
+<h3 id="Formal_syntax">Formal syntax</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="Specifications" name="Specifications">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("CSS Masks", "#propdef-mask-border-width", "mask-border-width")}}</td>
+   <td>{{Spec2("CSS Masks")}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<p>{{cssinfo}}</p>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>待定</p>