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---
title: <var>
slug: Web/HTML/Element/var
tags:
- HTML
- Web
translation_of: Web/HTML/Element/var
---
<div></div>
<div></div>
<div>{{HTMLRef}}</div>
<div></div>
<div>HTML Variable元素（<var>）表示数学表达式或编程上下文中的变量名称。尽管该行为取决于浏览器，但通常使用当前字体的斜体形式显示。</div>
<h2 id="概述">概述</h2>
<p><strong><var> 标签</strong>表示变量的名称，或者由用户提供的值。</p>
<table class="standard-table">
<tbody>
<tr>
<td>允许内容</td>
<td>Phrasing content</td>
</tr>
<tr>
<td>标签闭合</td>
<td>Both start and end tags are required</td>
</tr>
<tr>
<td>允许的父级元素</td>
<td>Any element that accepts <a href="/en-US/docs/HTML/Content_categories#Phrasing_content" title="HTML/Content categories#Phrasing content">phrasing content</a>.</td>
</tr>
<tr>
<td>规范元素</td>
<td><a href="http://www.whatwg.org/html/#the-var-element">HTML, "The <code>var</code> element"</a></td>
</tr>
</tbody>
</table>
<h2 id="属性">属性</h2>
<p><span style="line-height: 21px;">本元素仅支持 </span><a href="https://developer.mozilla.org/en-US/docs/HTML/Global_attributes" style="line-height: 21px;" title="HTML/Global attributes">全局属性</a><span style="line-height: 21px;">.</span></p>
<h2 id="DOM_接口">DOM 接口</h2>
<p>本元素支持 <code><a href="/en-US/docs/DOM/element" title="DOM/element">HTMLElement</a></code> 接口</p>
<div class="note">
<p><strong>提示: </strong>Gecko 1.9.2 开始, Firefox支持本元素使用 <a href="/en-US/docs/DOM/span" title="DOM/span"><span style="font-family: courier new;">HTMLSpanElement</span></a> 接口。</p>
</div>
<h2 id="默认样式">默认样式</h2>
<pre class="brush:css">var {
font-style: italic;
}
</pre>
<h2 id="示例">示例</h2>
<pre class="brush:html"><p> A simple equation: <var>x</var> = <var>y</var> + 2 </p>
</pre>
<p>A simple equation: <var>x</var> = <var>y</var> + 2</p>
<div>
<p>The output:</p>
<p>{{EmbedLiveSample("Basic_example", 650,80)}}</p>
</div>
<div>
<h3 id="Overriding_the_default_style">Overriding the default style</h3>
<p>Using CSS, you can override the default style for the <code><var></code> element. In this example, variable names are rendered using bold Courier if it's available, otherwise it falls back to the default monospace font.</p>
<h4 id="CSS">CSS</h4>
<pre>var {
font: bold 15px "Courier", "Courier New", monospace;
}</pre>
<h4 id="HTML">HTML</h4>
<pre><p>The variables <var>minSpeed</var> and <var>maxSpeed</var> control
the minimum and maximum speed of the apparatus in revolutions
per minute (RPM).</p></pre>
<p>This HTML uses <code><var></code> to enclose the names of two variables.</p>
<h4 id="Result">Result</h4>
<p>{{EmbedLiveSample("Overriding_the_default_style", 650, 120)}}</p>
<h2 id="Specifications">Specifications</h2>
<table>
<thead>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
</thead>
<tbody>
<tr>
<td>{{SpecName('HTML WHATWG', 'text-level-semantics.html#the-var-element', '<var>')}}</td>
<td>{{Spec2('HTML WHATWG')}}</td>
<td></td>
</tr>
<tr>
<td>{{SpecName('HTML5 W3C', 'textlevel-semantics.html#the-var-element', '<var>')}}</td>
<td>{{Spec2('HTML5 W3C')}}</td>
<td></td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<p>The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
<p>{{Compat("html.elements.var")}}</p>
</div>
|
