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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: mask-border
+slug: Web/CSS/mask-border
+translation_of: Web/CSS/mask-border
+---
+<div>{{cssref}}{{SeeCompatTable}}</div>
+
+<p><a href="/en-US/docs/Web/CSS">CSS</a> 属性 <strong><code>mask-border</code></strong> 允许你创建一个紧贴元素边框边缘的mask.</p>
+
+<p>该属性为以下属性的<a href="/en-US/docs/Web/CSS/Shorthand_properties">简写</a>: {{cssxref("mask-border-source")}}, {{cssxref("mask-border-slice")}}, {{cssxref("mask-border-width")}}, {{cssxref("mask-border-outset")}}, {{cssxref("mask-border-repeat")}}, and {{cssxref("mask-border-mode")}}. 与其他简写的属性一样,任何一个漏写的子属性,将会被设置为他们的<a href="/en-US/docs/Web/CSS/initial_value">初始值</a>.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush: css no-line-numbers">/* source | slice */
+mask-border: url('border-mask.png') 25;
+
+/* source | slice | repeat */
+mask-border: url('border-mask.png') 25 space;
+
+/* source | slice | width */
+mask-border: url('border-mask.png') 25 / 35px;
+
+/* source | slice | width | outset | repeat | mode */
+mask-border: url('border-mask.png') 25 / 35px / 12px space alpha;
+</pre>
+
+<h3 id="Values">Values</h3>
+
+<dl>
+ <dt><code>&lt;'mask-border-source'&gt;</code></dt>
+ <dd>该属性为源图像. 参见 {{cssxref("mask-border-source")}}.</dd>
+ <dt><code>&lt;'mask-border-slice'&gt;</code></dt>
+ <dd>将源图像切割后的区域的尺寸,最多可指定四个值. 参见 {{cssxref("mask-border-slice")}}.</dd>
+ <dt><code>&lt;'mask-border-width'&gt;</code></dt>
+ <dd>边框mask的宽度. 最多可指定四个值. 参见 {{cssxref("mask-border-width")}}.</dd>
+ <dt><code>&lt;'mask-border-outset'&gt;</code></dt>
+ <dd>边框mask距离元素外边界的距离. 最多可指定四个值. 参见 {{cssxref("mask-border-outset")}}.</dd>
+ <dt><code>&lt;'mask-border-repeat'&gt;</code></dt>
+ <dd>定义如何调整源图像的边缘区域以适应边框mask的尺寸. 最多可指定四个值. 参见 {{cssxref("mask-border-repeat")}}.</dd>
+ <dt><code>&lt;'mask-border-mode'&gt;</code></dt>
+ <dd>定义是否将源图片设置为明亮度mask,或者透明度mask. 参见 {{cssxref("mask-border-mode")}}.</dd>
+</dl>
+
+<h3 id="形式语法">形式语法</h3>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="范例">范例</h2>
+
+<h3 id="Bitmap">Bitmap</h3>
+
+<p>在此范例中,我们将使用钻石图案来给元素添加mask. mask的源文件是一个 ".png" 文件,大小为 90像素 * 90 像素,三颗钻石垂直和水平交叉;</p>
+
+<p><img alt="" src="https://mdn.mozillademos.org/files/15836/mask-border-diamonds.png" style="height: 90px; width: 90px;"></p>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html">&lt;div id="bitmap"&gt;This element is surrounded by a bitmap-based mask border! Pretty neat, isn't it?&lt;/div&gt;</pre>
+
+<h4 id="CSS">CSS</h4>
+
+<p>为了适应一个钻石的大小,我们使用90/3 或者30,用于设置将图像切割至边角以及边缘区域的值,并设置repeat属性为 <code>round</code> ,该属性使得切片均匀贴合,例如:没有裁剪和空隙.</p>
+
+<pre class="brush: css">div {
+ width: 200px;
+ background-color: lavender;
+ border: 18px solid salmon;
+ padding: 10px;
+
+ mask-border:
+ url("https://mdn.mozillademos.org/files/15836/mask-border-diamonds.png") /* source */
+ 30 / /* slice */
+ 36px 18px /* width */
+ round; /* repeat */
+}
+</pre>
+
+<h4 id="Result">Result</h4>
+
+<p>{{EmbedLiveSample("Example")}}</p>
+
+<h2 id="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", "mask-border")}}</td>
+ <td>{{Spec2("CSS Masks")}}</td>
+ <td>Initial definition</td>
+ </tr>
+ </tbody>
+</table>
+
+<p>{{cssinfo}}</p>
+
+<h2 id="浏览器兼容性Edit">浏览器兼容性<a class="button section-edit only-icon" href="https://developer.mozilla.org/en-US/docs/Web/CSS/border-image$edit#Browser_compatibility" rel="nofollow, noindex"><span>Edit</span></a></h2>
+
+<p><span>TBD</span></p>