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+---
+title: <mroot>
+slug: Web/MathML/Element/mroot
+translation_of: Web/MathML/Element/mroot
+---
+<div>{{MathMLRef}}</div>
+
+<p class="summary">MathML的<strong><code>&lt;mroot&gt;</code></strong>元素用来表示一个有明确根指数的根式。它接受两个参数，语法如下：<code><strong>&lt;mroot&gt; base index &lt;/mroot&gt;</strong></code>。</p>
+
+<h2 id="属性">属性</h2>
+
+<dl>
+ <dt id="attr-class-id-style">class, id, style</dt>
+ <dd>供<a href="/en-US/docs/CSS">样式表</a>使用。</dd>
+ <dt id="attr-href">href</dt>
+ <dd>用来设置标签点击后跳转的链接。</dd>
+ <dt id="attr-mathbackground">mathbackground</dt>
+ <dd>用来设置标签的背景色，可以使用<code><strong>#rgb</strong></code>、<strong><code>#rrggbb</code></strong>或者<a href="/zh-CN/docs/Web/CSS/color_value">HTML颜色名</a>。</dd>
+ <dt id="attr-mathcolor">mathcolor</dt>
+ <dd>用来设置文字（包括根底数、根指数和根号本身）的颜色，同样可以使用<code><strong>#rgb</strong></code>、<strong><code>#rrggbb</code></strong>或者<a href="/zh-CN/docs/Web/CSS/color_value">HTML颜色名</a>。</dd>
+</dl>
+
+<h2 id="例子">例子</h2>
+
+<p>下述代码表示：<img alt="x" src="/files/3200/mroot.png" style="margin-left: 10px; vertical-align: middle;"></p>
+
+<p>您的浏览器的渲染结果：<math><mroot><mi>x</mi> <mn>3</mn> </mroot> </math></p>
+
+<pre class="brush: html">&lt;math&gt;
+
+ &lt;mroot&gt;
+    &lt;mi&gt;x&lt;/mi&gt;
+    &lt;mn&gt;3&lt;/mn&gt;
+ &lt;/mroot&gt;
+
+&lt;/math&gt;
+</pre>
+
+<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('MathML3', 'chapter3.html#presm.mroot', 'mroot') }}</td>
+   <td>{{ Spec2('MathML3') }}</td>
+   <td>Current specification</td>
+  </tr>
+  <tr>
+   <td>{{ SpecName('MathML2', 'chapter3.html#presm.mroot', 'mroot') }}</td>
+   <td>{{ Spec2('MathML2') }}</td>
+   <td>Initial specification</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{ CompatGeckoDesktop("1.0") }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>5.1</td>
+  </tr>
+  <tr>
+   <td><code>href</code></td>
+   <td>{{CompatNo}}</td>
+   <td>{{ CompatGeckoDesktop("7.0") }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td><code>mathbackground</code></td>
+   <td>{{CompatNo}}</td>
+   <td>{{ CompatGeckoDesktop("2.0") }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>5.1</td>
+  </tr>
+  <tr>
+   <td><code>mathcolor</code></td>
+   <td>{{CompatNo}}</td>
+   <td>{{ CompatGeckoDesktop("2.0") }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>5.1</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{ CompatGeckoMobile("1.0") }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td><code>href</code></td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{ CompatGeckoMobile("7.0") }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td><code>mathbackground</code></td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{ CompatGeckoMobile("2.0") }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+  <tr>
+   <td><code>mathcolor</code></td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{ CompatGeckoMobile("2.0") }}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{ MathMLElement("msqrt") }} (Square root without an index)</li>
+</ul>