---
title: ':fullscreen'
slug: 'Web/CSS/:fullscreen'
tags:
  - CSS
  - CSS Pseudo-class
  - Experimental
  - Full-screen
  - Reference
translation_of: 'Web/CSS/:fullscreen'
---
<div>{{CSSRef}}{{SeeCompatTable}}</div>

<h2 id="总结">总结</h2>

<p><code><font face="Open Sans, Arial, sans-serif">css伪类</font>:fullscreen应用于当前处于全屏显示模式的元素。</code> 它不仅仅选择顶级元素，还包括所有已显示的栈内元素。</p>

<div class="note">W3C标准使用不带破折号的单词:fullscreen，但Webkit和Gecko应用接口各自使用前缀带有破折号的变量：<code>:-webkit-full-screen</code> 和<code>:-moz-full-screen。</code>微软的Edge和Internet Explorer各自使用标准语法：<code>:fullscreen</code>和<code>:-ms-fullscreen。</code></div>

<h2 id="语法">语法</h2>

{{csssyntax}}

<h2 id="例子">例子</h2>

<h3 id="HTML">HTML</h3>

<pre class="brush: html">&lt;div id="fullscreen"&gt;
  &lt;h1&gt;:fullscreen Demo&lt;/h1&gt;
  &lt;p&gt; This will become a big red text when on fullscreen.&lt;/p&gt;
  &lt;button id="fullscreen-button"&gt;Enter Fullscreen&lt;/button&gt;
&lt;/div&gt;
</pre>

<div class="hidden">
<h3 id="Javascript">Javascript</h3>

<pre class="brush: js">var fullscreenButton = document.getElementById("fullscreen-button");
var fullscreenDiv    = document.getElementById("fullscreen");
var fullscreenFunc   = fullscreenDiv.requestFullscreen;
if (!fullscreenFunc) {
  ['mozRequestFullScreen',
   'msRequestFullscreen',
   'webkitRequestFullScreen'].forEach(function (req) {
     fullscreenFunc = fullscreenFunc || fullscreenDiv[req];
   });
}
function enterFullscreen() {
  fullscreenFunc.call(fullscreenDiv);
}
fullscreenButton.addEventListener('click', enterFullscreen);
</pre>

<h3 id="Browser-Specific_CSS">Browser-Specific CSS</h3>

<pre class="brush: css">#fullscreen:-moz-full-screen {
  padding: 42px;
  background-color: pink;
  border:2px solid #f00;
  font-size: 200%;
}
#fullscreen:-ms-fullscreen {
  padding: 42px;
  background-color: pink;
  border:2px solid #f00;
  font-size: 200%;
}
#fullscreen:-webkit-full-screen {
  padding: 42px;
  background-color: pink;
  border:2px solid #f00;
  font-size: 200%;
}

#fullscreen:-moz-full-screen &gt; h1 {
  color: red;
}
#fullscreen:-ms-fullscreen &gt; h1 {
  color: red;
}
#fullscreen:-webkit-full-screen &gt; h1 {
  color: red;
}

#fullscreen:-moz-full-screen &gt; p {
  color: DarkRed;
}
#fullscreen:-ms-fullscreen &gt; p {
  color: DarkRed;
}
#fullscreen:-webkit-full-screen &gt; p {
  color: DarkRed;
}

#fullscreen:-moz-full-screen &gt; button {
  display: none;
}
#fullscreen:-ms-fullscreen &gt; button {
  display: none;
}
#fullscreen:-webkit-full-screen &gt; button {
  display: none;
}
</pre>
</div>

<h3 id="CSS">CSS</h3>

<pre class="brush: css">#fullscreen:fullscreen {
  padding: 42px;
  background-color: pink;
  border:2px solid #f00;
  font-size: 200%;
}

#fullscreen:fullscreen &gt; h1 {
  color: red;
}

#fullscreen:fullscreen &gt; p {
  color: DarkRed;
}

#fullscreen:fullscreen &gt; button {
  display: none;
}
</pre>

<h3 id="结果">结果</h3>

<p>{{ LiveSampleLink('Example', "(If the 'Enter Fullscreen' button doesn't work, try here)") }}</p>

<p>{{ EmbedLiveSample('Example','80%','200px') }}</p>

<h2 id="特点">特点</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">特点</th>
   <th scope="col">情况</th>
   <th scope="col">评论</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName('Fullscreen', '#:fullscreen-pseudo-class', ':fullscreen')}}</td>
   <td>{{Spec2('Fullscreen')}}</td>
   <td>Initial definition</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

{{Compat("css.selectors.fullscreen")}}

<h2 id="再看看">再看看</h2>

<ul>
 <li>{{cssxref("::backdrop")}}</li>
 <li><a href="/en-US/docs/Web/API/Fullscreen_API">Using full-screen mode</a></li>
 <li>{{ domxref("Element.requestFullscreen()") }}</li>
 <li>{{ domxref("Document.exitFullscreen()") }}</li>
 <li>{{ domxref("Document.fullscreen") }}</li>
 <li>{{ domxref("Document.fullscreenElement") }}</li>
 <li>{{HTMLAttrXRef("allowfullscreen", "iframe")}}</li>
 <li>{{cssxref(":-moz-full-screen-ancestor")}}</li>
</ul>