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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>&lt;dfn&gt;</strong>) 表示术语的一个定义。</p>
+
+<div class="note"><strong>HTML5 使用说明：</strong>
+
+<ul>
+ <li><code>&lt;dfn&gt;</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>&lt;dfn&gt;</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>&lt;dfn&gt;</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">&lt;!-- Define "The Internet" --&gt;
+&lt;p&gt;&lt;dfn id="def-internet"&gt;The Internet&lt;/dfn&gt; is a global system of interconnected networks that use the Internet Protocol Suite (TCP/IP) to serve billions of users worldwide.&lt;/p&gt;
+</pre>
+
+<p>在同一文档的后面：</p>
+
+<pre class="brush: html">&lt;dl&gt;
+  &lt;!-- Define "World-Wide Web" and reference definition for "the Internet" --&gt;
+  &lt;dt&gt;
+    &lt;dfn&gt;
+      &lt;abbr title="World-Wide Web"&gt;WWW&lt;/abbr&gt;
+    &lt;/dfn&gt;
+  &lt;/dt&gt;
+  &lt;dd&gt;The World-Wide Web (WWW) is a system of interlinked hypertext documents accessed on &lt;a href="#def-internet"&gt;the Internet&lt;/a&gt;.&lt;/dd&gt;
+&lt;/dl&gt;
+</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', '&lt;dfn&gt;')}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML5 W3C', 'text-level-semantics.html#the-dfn-element', '&lt;dfn&gt;')}}</td>
+   <td>{{Spec2('HTML5 W3C')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML4.01', 'struct/text.html#h-9.2.1', '&lt;dfn&gt;')}}</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>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>特性</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>基本支持</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("1.0")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>特性</th>
+   <th>Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>基本支持</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile("1.0")}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<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>