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---
title: <bdi>
slug: Web/HTML/Element/bdi
tags:
- BiDi
- Element
- HTML
- HTML text-level semantics
- Reference
- Web
translation_of: Web/HTML/Element/bdi
---
<h2 id="Summary">Summary</h2>
<p>{{HTMLRef}}<br>
<strong>HTML </strong>双向隔离元素 (<strong> <code><bdi></code> </strong>) 告诉浏览器的双向算法将其包含的文本与周围的文本隔离,当网站动态插入一些文本且不知道所插入文本的方向性时,此功能特别有用。</p>
<p>{{EmbedInteractiveExample("pages/tabbed/bdi.html", "tabbed-standard")}}</p>
<p class="note">尽管同样的显示效果可以通过使用 CSS 规则 {{cssxref("unicode-bidi")}}:隔离{{HTMLElement("span")}}或者其他文本格式化元素,但语义信息只能通过<bdi>元素传递。特别是,当浏览器允许忽略 CSS 样式时,在这种情况下,使用<bdi>仍然可以保证文本正确显示,而使用 CSS 样式来传递语义时就显得毫无用处。</p>
<table class="properties">
<tbody>
<tr>
<th scope="row"><a href="/en-US/docs/HTML/Content_categories" title="HTML/Content_categories">Content categories</a></th>
<td><a href="/en-US/docs/HTML/Content_categories#Flow_content" title="HTML/Content categories#Flow content">Flow content</a>, <a href="/en-US/docs/HTML/Content_categories#Phrasing_content" title="HTML/Content_categories#Phrasing_content">phrasing content</a>, palpable content.</td>
</tr>
<tr>
<th scope="row">Permitted content</th>
<td><a href="/en-US/docs/HTML/Content_categories#Phrasing_content" title="HTML/Content_categories#Flow_content">Phrasing content</a>.</td>
</tr>
<tr>
<th scope="row">Tag omission</th>
<td>{{no_tag_omission}}</td>
</tr>
<tr>
<th scope="row">Permitted parent elements</th>
<td>Any element that accepts <a href="/en-US/docs/HTML/Content_categories#Phrasing_content" title="HTML/Content_categories#Flow_content">phrasing content</a>.</td>
</tr>
<tr>
<th scope="row">DOM interface</th>
<td>{{domxref("HTMLElement")}}</td>
</tr>
</tbody>
</table>
<h2 id="属性">属性</h2>
<p>{{htmlattrdef("dir")}}</p>
<p>如同其他 HTML 元素一样,它包含<a href="/en-US/docs/HTML/Global_attributes" title="HTML/Global attributes">全局属性</a>,但是有一些语义上的细微差别:<strong>dir</strong>属性不继承父元素。如果没有设置,默认值即为 auto,以便浏览器根据元素内容决定元素内容的方向。</p>
<h2 id="示例">示例</h2>
<pre class="brush: html"><p dir="ltr">This arabic word <bdi>ARABIC_PLACEHOLDER</bdi> is automatically displayed right-to-left.</p>
</pre>
<h3 id="结果">结果</h3>
<p dir="ltr">This arabic word REDLOHECALP_CIBARA is automatically displayed right-to-left.</p>
<h2 id="Specifications" name="Specifications">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('HTML WHATWG', 'text-level-semantics.html#the-bdi-element', '<bdi>')}}</td>
<td>{{Spec2('HTML WHATWG')}}</td>
<td></td>
</tr>
<tr>
<td>{{SpecName('HTML5 W3C', 'the-bdi-element.html#the-bdi-element', '<bdi>')}}</td>
<td>{{Spec2('HTML5 W3C')}}</td>
<td></td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容">浏览器兼容</h2>
<p>{{Compat("html.elements.bdi")}}</p>
<h2 dir="ltr" id="参见">参见</h2>
<ul>
<li>相关元素: {{HTMLElement("bdo")}}</li>
<li>相关属性: {{cssxref("direction")}}, {{cssxref("unicode-bidi")}}</li>
</ul>
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