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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><mroot></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><mroot> base index </mroot></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"><math>
<mroot>
<mi>x</mi>
<mn>3</mn>
</mroot>
</math>
</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>
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