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Test Info:

<!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>
<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>