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---
title: <dfn>
slug: Web/HTML/Element/dfn
translation_of: Web/HTML/Element/dfn
---
<h2 id="摘要">摘要</h2>
<p><em>HTML 定义元素</em> (<strong><dfn></strong>) 表示术语的一个定义。</p>
<div class="note"><strong>HTML5 使用说明：</strong>
<ul>
<li><code><dfn></code> 元素标记了被定义的术语；术语定义应当在 {{HTMLElement("p")}}, {{HTMLElement("section")}}或定义列表 (通常是{{HTMLElement("dt")}}, {{HTMLElement("dd")}} 对) 中给出。</li>
<li>被定义术语的值由下列规则确定：
<ol>
<li>如果 <code><dfn></code> 元素有一个 <code><strong>title</strong></code> 属性，那么该术语的值就是该属性的值。</li>
<li>否则，如果它仅包含一个 {{HTMLElement("abbr")}} 元素，该元素拥有 {{htmlattrxref("title", "abbr")}} 属性，那么该术语的值就是该属性的值。</li>
<li>否则，<code><dfn></code> 元素的文本内容就是该术语的值。</li>
</ol>
</li>
</ul>
</div>
<table class="properties">
<tbody>
<tr>
<th scope="row"><a href="/zh-CN/docs/Web/Guide/HTML/Content_categories" title="HTML/Content_categories">内容分类</a></th>
<td><a href="/zh-CN/docs/Web/Guide/HTML/Content_categories#Flow_content" title="HTML/Content categories#Flow content">Flow content</a>, <a href="/zh-CN/docs/Web/Guide/HTML/Content_categories#Phrasing_content" title="HTML/Content categories#Phrasing content">phrasing content</a>, palpable content.</td>
</tr>
<tr>
<th scope="row">允许的内容</th>
<td><a href="/zh-CN/docs/Web/Guide/HTML/Content_categories#Phrasing_content" title="HTML/Content_categories#Phrasing_content">Phrasing content</a>, but no {{HTMLElement("dfn")}} element must be a descendant.</td>
</tr>
<tr>
<th scope="row">标签省略</th>
<td>{{no_tag_omission}}</td>
</tr>
<tr>
<th scope="row">允许的父元素</th>
<td>Any element that accepts <a href="/zh-CN/docs/Web/Guide/HTML/Content_categories#Phrasing_content" title="HTML/Content_categories#Phrasing_content">phrasing content</a>.</td>
</tr>
<tr>
<th scope="row">DOM 接口</th>
<td>{{domxref("HTMLElement")}}</td>
</tr>
</tbody>
</table>
<h2 id="属性">属性</h2>
<p><span style="line-height: 21px;">该元素包括 </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>。</p>
<p>在 HTML5 中，<code><strong>title</strong></code> 属性拥有特殊含义，见上文。</p>
<h2 id="示例">示例</h2>
<p>下列示例是合法的 HTML5。</p>
<pre class="brush: html"><!-- Define "The Internet" -->
<p><dfn id="def-internet">The Internet</dfn> is a global system of interconnected networks that use the Internet Protocol Suite (TCP/IP) to serve billions of users worldwide.</p>
</pre>
<p>在同一文档的后面：</p>
<pre class="brush: html"><dl>
<!-- Define "World-Wide Web" and reference definition for "the Internet" -->
<dt>
<dfn>
<abbr title="World-Wide Web">WWW</abbr>
</dfn>
</dt>
<dd>The World-Wide Web (WWW) is a system of interlinked hypertext documents accessed on <a href="#def-internet">the Internet</a>.</dd>
</dl>
</pre>
<h3 id="结果">结果</h3>
<p>{{ EmbedLiveSample('Examples', '600', '150', '', 'Web/HTML/Element/dfn') }}</p>
<h2 id="Specifications" name="Specifications">标准</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">标准</th>
<th scope="col">状态</th>
<th scope="col">备注</th>
</tr>
</thead>
<tbody>
<tr>
<td>{{SpecName('HTML WHATWG', 'text-level-semantics.html#the-dfn-element', '<dfn>')}}</td>
<td>{{Spec2('HTML WHATWG')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName('HTML5 W3C', 'text-level-semantics.html#the-dfn-element', '<dfn>')}}</td>
<td>{{Spec2('HTML5 W3C')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName('HTML4.01', 'struct/text.html#h-9.2.1', '<dfn>')}}</td>
<td>{{Spec2('HTML4.01')}}</td>
<td> </td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
{{Compat("html.elements.dfn")}}
<h2 id="相关链接">相关链接</h2>
<ul>
<li>定义列表的相关元素：{{HTMLElement("dl")}}, {{HTMLElement("dt")}}, {{HTMLElement("dd")}}</li>
<li>{{HTMLElement("abbr")}}</li>
</ul>
<p>{{HTMLRef}}</p>
|
