From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: IntersectionObserver.root
+slug: Web/API/IntersectionObserver/root
+translation_of: Web/API/IntersectionObserver/root
+---
+<p><code>root</code> 属性用来获取当前 <code>intersectionObserver</code> 实例的根元素。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><var>intersectionObserver</var>.root;
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('IntersectionObserver', '#dom-intersectionobserver-root', 'IntersectionObserver')}}</td>
+   <td>{{Spec2('IntersectionObserver')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome(51.0)}}</td>
+   <td>{{CompatNo}}<sup>[1]</sup></td>
+   <td>{{CompatNo}}<sup>[2]</sup></td>
+   <td>{{CompatNo}}</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>Android Webview</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Firefox OS</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+   <th>Chrome for Android</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatChrome(51.0)}}</td>
+   <td>{{CompatNo}}<sup>[2]</sup></td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatChrome(51.0)}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1]  实现于 <a href="https://developer.microsoft.com/en-us/microsoft-edge/platform/status/intersectionobserver/">Windows Insider Preview Build 14986</a>。</p>
+
+<p>[2] 实现于 {{geckoRelease("53.0")}}，但默认处于关闭状态，需要打开<code>dom.IntersectionObserver.enabled。</code></p>
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