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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>