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+<!DOCTYPE HTML>
+<html>
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 1406102</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <style type="text/css">
+ html {
+ height: 100%;
+ }
+ body {
+ height: 2866px;
+ }
+ </style>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1406102">Mozilla Bug 1406102</a>
+<p id="display"></p>
+<div id="content">
+ <div id="target"></div>
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+ let observer = new IntersectionObserver(function (changes) {
+ ok(changes[0].intersectionRatio >= 0,
+ 'intersectionRatio should be equal to or greater than zero');
+ if (changes[0].intersectionRatio > 0) {
+ SimpleTest.finish();
+ }
+ });
+ observer.observe(document.body);
+ SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+<div id="log">
+</div>
+</body>
+</html>