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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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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>&lt;bdi&gt;</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&lt;bdi&gt;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&lt;bdi&gt;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">&lt;p dir="ltr"&gt;This arabic word &lt;bdi&gt;ARABIC_PLACEHOLDER&lt;/bdi&gt; is automatically displayed right-to-left.&lt;/p&gt;
+</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', '&lt;bdi&gt;')}}</td>
+ <td>{{Spec2('HTML WHATWG')}}</td>
+ <td></td>
+ </tr>
+ <tr>
+ <td>{{SpecName('HTML5 W3C', 'the-bdi-element.html#the-bdi-element', '&lt;bdi&gt;')}}</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>