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https://bugzilla.mozilla.org/show_bug.cgi?id=1457051
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  <meta charset="utf-8">
  <title>Test for Bug 1457051</title>
  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
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  /** Test for Bug 1457051 **/
  ok(Element.isInstance(document.documentElement), "Basic isInstance works");
  ok(!Element.isInstance(null),
     "Passing null should return false without throwing");
  ok(!Element.isInstance(5), "Passing 5 should return false without throwing");
  var obj = Object.create(Element.prototype);
  ok(obj instanceof Element, "instanceof should walk the proto chain");
  ok(!Element.isInstance(obj), "isInstance should be a pure brand check");

  </script>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1457051">Mozilla Bug 1457051</a>
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<div id="content" style="display: none">

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<pre id="test">
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