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+---
+title: 文本装饰线厚度(粗细)
+slug: Web/CSS/文本装饰线厚度(粗细)
+tags:
+  - 装饰线粗细 装饰线厚度
+translation_of: Web/CSS/text-decoration-thickness
+---
+<div>{{CSSRef}}</div>
+
+<div><a href="/en-US/docs/CSS">CSS</a> 属性 <strong><code>text-decoration-thickness</code></strong> 用于设置元素中文本所使用的装饰线（如 line-through、underline 或 overline）的笔触厚度。</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="brush:css no-line-numbers notranslate">/* Single keyword */
+text-decoration-thickness: auto;
+text-decoration-thickness: from-font;
+
+/* length */
+text-decoration-thickness: 0.1em;
+text-decoration-thickness: 3px;
+
+/* percentage */
+text-decoration-thickness: 10%;
+
+/* Global values */
+text-decoration-thickness: inherit;
+text-decoration-thickness: initial;
+text-decoration-thickness: unset;</pre>
+
+<h3 id="值">值</h3>
+
+<dl>
+ <dt><code>auto</code></dt>
+ <dd>由浏览器为文本装饰线选择合适的厚度。</dd>
+ <dt><code>from-font</code></dt>
+ <dd>如果字体文件中包含了首选的厚度值，则使用字体文件的厚度值。如果字体文件中没有包含首选的厚度值，则效果和设置为 <code>auto</code> 一样，由浏览器选择合适的厚度值。</dd>
+ <dt><code>&lt;length&gt;</code></dt>
+ <dd>将文本装饰线的厚度设置为一个 {{cssxref('length')}} 类型的值，覆盖掉字体文件建议的值或浏览器默认的值。</dd>
+ <dt><code>&lt;percentage&gt;</code></dt>
+ <dd>Specifies the thickness of the text decoration line as a {{cssxref('percentage')}} of <strong>1em</strong> in the current font. A percentage inherits as a relative value, and so therefore scales with changes in the font. The browser must use a minimum of 1 device pixel. For a given application of this property, the thickness is constant across the whole box it is applied to, even if there are child elements with a different font size.</dd>
+</dl>
+
+<h2 id="Formal_definition">Formal definition</h2>
+
+<p>{{CSSInfo}}</p>
+
+<h2 id="Formal_syntax">Formal syntax</h2>
+
+<pre class="syntaxbox notranslate">{{csssyntax}}</pre>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="Varying_thickness">Varying thickness</h3>
+
+<h4 id="HTML">HTML</h4>
+
+<pre class="brush: html notranslate">&lt;p class="thin"&gt;Here's some text with a 1px red underline.&lt;/p&gt;
+&lt;p class="thick"&gt;This one has a 5px red underline.&lt;/p&gt;
+&lt;p class="shorthand"&gt;This uses the equivalent shorthand.&lt;/p&gt;</pre>
+
+<h4 id="CSS">CSS</h4>
+
+<pre class="brush: css notranslate">.thin {
+  text-decoration-line: underline;
+  text-decoration-style: solid;
+  text-decoration-color: red;
+  text-decoration-thickness: 1px;
+}
+
+.thick {
+  text-decoration-line: underline;
+  text-decoration-style: solid;
+  text-decoration-color: red;
+  text-decoration-thickness: 5px;
+}
+
+.shorthand {
+  text-decoration: underline solid red 5px;
+}</pre>
+
+<h4 id="Results">Results</h4>
+
+<p>{{ EmbedLiveSample('Varying_thickness', '', '', '') }}</p>
+
+<h2 id="规范">规范</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('CSS4 Text Decoration', '#text-decoration-width-property', 'text-decoration-width')}}</td>
+   <td>{{Spec2('CSS4 Text Decoration')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<div class="blockIndicator note">
+<p><strong>Note</strong>: The property used to be called <code>text-decoration-width</code>, but was updated in 2019 to <code>text-decoration-thickness</code>.</p>
+</div>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("css.properties.text-decoration-thickness")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{cssxref("text-decoration")}}</li>
+ <li>{{cssxref("text-underline-offset")}}</li>
+</ul>