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  <title>Test for Bug 1406102</title>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1406102">Mozilla Bug 1406102</a>
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<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>
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