---
title: document.mozFullScreenElement
slug: Web/API/Document/fullscreenElement
translation_of: Web/API/DocumentOrShadowRoot/fullscreenElement
original_slug: Web/API/DocumentOrShadowRoot/fullscreenElement
---
<p>{{ ApiRef() }}</p>
<h3 id="Summary" name="Summary">概述</h3>
<p>返回当前文档中正在以全屏模式显示的{{ domxref("Element") }}节点,如果没有使用全屏模式,则返回<code>null</code>.</p>
<h3 id="Syntax" name="Syntax">语法</h3>
<pre class="eval"><em>var element</em> = <em>document</em>.mozFullScreenElement;
</pre>
<h3 id="Example" name="Example">示例</h3>
<pre class="eval">function isVideoInFullsreen() {
  if (document.mozFullScreenElement &amp;&amp; document.mozFullScreenElement.nodeName == 'VIDEO') {
    console.log('您的视频正在以全屏模式显示');
  }
}</pre>
<h3 id="辅助">辅助</h3>
<p>查看<a href="/zh-CN/docs/DOM/Using_full-screen_mode" title="zh-CN/docs/DOM/Using full-screen mode">使用"全屏模式"</a>页面了解详情.</p>
<h3 id="Specification" name="Specification">浏览器兼容性</h3>
<p>{{ CompatibilityTable() }}</p>
<div id="compat-desktop">
 <table class="compat-table">
  <tbody>
   <tr>
    <th>Feature</th>
    <th>Chrome</th>
    <th>Firefox (Gecko)</th>
    <th>Internet Explorer</th>
    <th>Opera</th>
    <th>Safari</th>
   </tr>
   <tr>
    <td>Basic support</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{ CompatGeckoDesktop("9.0") }}</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{ CompatUnknown() }}</td>
   </tr>
  </tbody>
 </table>
</div>
<div id="compat-mobile">
 <table class="compat-table">
  <tbody>
   <tr>
    <th>Feature</th>
    <th>Android</th>
    <th>Firefox Mobile (Gecko)</th>
    <th>IE Mobile</th>
    <th>Opera Mobile</th>
    <th>Safari Mobile</th>
   </tr>
   <tr>
    <td>Basic support</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{ CompatGeckoMobile("9.0") }}</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{ CompatUnknown() }}</td>
    <td>{{ CompatUnknown() }}</td>
   </tr>
  </tbody>
 </table>
</div>
<h3 id="Specification" name="Specification">规范</h3>
<p>该方法提案已经进入相关规范草案 <a class="external" href="http://dvcs.w3.org/hg/fullscrezh-CN/raw-file/tip/Overview.html#dom-document-fullscreenelement" title="http://dvcs.w3.org/hg/fullscrezh-CN/raw-file/tip/Overview.html#dom-document-fullscreenelement">http://dvcs.w3.org/hg/fullscrezh-CN/raw-file/tip/Overview.html#dom-document-fullscreenelement</a></p>
<h3 id="相关链接">相关链接</h3>
<ul>
 <li><a href="/zh-CN/docs/DOM/Using_full-screen_mode" title="zh-CN/docs/DOM/Using full-screen mode">Using full-screen mode</a></li>
 <li>{{ domxref("element.mozRequestFullScreen()") }}</li>
 <li>{{ domxref("document.mozCancelFullScreen()") }}</li>
 <li>{{ domxref("document.mozFullScreen") }}</li>
 <li>{{ domxref("document.mozFullScreenEnabled") }}</li>
 <li>{{ cssxref(":-moz-full-screen") }}</li>
 <li>{{ HTMLAttrXRef("allowfullscreen", "iframe") }}</li>
</ul>