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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: ':host'
+slug: 'Web/CSS/:host'
+tags:
+ - ':host'
+ - CSS
+ - DOM
+translation_of: 'Web/CSS/:host'
+---
+<div>{{ CSSRef }}</div>
+
+<p><span class="seoSummary"><strong><code>:host</code></strong> CSS伪类选择包含其内部使用的CSS的shadow DOM的根元素 - 换句话说,这允许你从其shadow DOM中选择一个自定义元素。</span></p>
+
+<div class="note">
+<p><strong>注意:</strong>在shadow DOM之外使用时,这没有任何效果。</p>
+</div>
+
+<pre class="brush: css no-line-numbers">/* Selects a shadow root host */
+:host {
+ font-weight: bold;
+}
+</pre>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">{{csssyntax}}</pre>
+
+<h2 id="示例">示例</h2>
+
+<p>以下片段取自我们的 <a href="https://github.com/mdn/web-components-examples/tree/master/host-selectors">host-selectors </a>示例(<a href="https://mdn.github.io/web-components-examples/host-selectors/">在线演示</a>)。</p>
+
+<p>在这个例子中,我们有一个简单的自定义元素 — <code>&lt;context-span&gt;</code> — 你可以包裹文本:</p>
+
+<pre class="brush: html">&lt;h1&gt;Host selectors &lt;a href="#"&gt;&lt;context-span&gt;example&lt;/context-span&gt;&lt;/a&gt;&lt;/h1&gt;
+</pre>
+
+<p>在元素的构造函数中,我们创建<code>style</code>和<code>span</code>元素,用自定义元素的内容填充<code>span</code>,并使用一些CSS规则填充<code>style</code> 元素:</p>
+
+<pre class="brush: js">let style = document.createElement('style');
+let span = document.createElement('span');
+span.textContent = this.textContent;
+
+const shadowRoot = this.attachShadow({mode: 'open'});
+shadowRoot.appendChild(style);
+shadowRoot.appendChild(span);
+
+style.textContent = 'span:hover { text-decoration: underline; }' +
+ ':host-context(h1) { font-style: italic; }' +
+ ':host-context(h1):after { content: " - no links in headers!" }' +
+ ':host-context(article, aside) { color: gray; }' +
+ ':host(.footer) { color : red; }' +
+ ':host { background: rgba(0,0,0,0.1); padding: 2px 5px; }';
+</pre>
+
+<p><code>:host { background: rgba(0,0,0,0.1); padding: 2px 5px; }</code> 规则设置<code>&lt;context-span&gt;</code>元素的所有实例的样式(此实例中为影子根元素)的所有实例。</p>
+
+<h2 id="规范">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('CSS Scope', '#host-selector', ':host') }}</td>
+ <td>{{ Spec2('CSS Scope') }}</td>
+ <td>Initial definition.</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">浏览器兼容</h2>
+
+<div>
+
+
+<p>{{Compat("css.selectors.host")}}</p>
+</div>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/Web_Components">Web components</a></li>
+ <li>{{cssxref(":host()")}}</li>
+ <li>{{cssxref(":host-context()")}}</li>
+</ul>