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<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=817420
-->
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  <meta charset="utf-8">
  <title>Test for Bug 817420</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=817420">Mozilla Bug 817420</a>
<p id="display"></p>
<div id="content" style="display: none">

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<pre id="test">
<script type="application/javascript">

/** Test for Bug 817420 **/
is(Object.getPrototypeOf(HTMLElement.prototype), Element.prototype,
   "Must have correct proto chain for HTMLElement.prototype");
is(Object.getPrototypeOf(document.createElementNS(null, "x")),
   Element.prototype,
   "Must have correct proto chain for random element");
is(Object.getPrototypeOf(document.createElement("noSuchElementName")),
   HTMLUnknownElement.prototype,
   "Must have correct proto chain for random HTML element");

// And check that it's really working as it should
function checkPropPresent(propName, objList, expected)
{
  for (obj of objList) {
    is(propName in obj,
       expected,
       obj + " should " + (expected ? "" : "not ") + "have the property");
  }
}
var objList = [ Element.prototype,
                HTMLElement.prototype,
                document.createElementNS(null, "x"),
                document.createElement("noSuchElementName"),
                document.body ]
checkPropPresent("somePropertyThatBetterNeverExist", objList, false);
Element.prototype.somePropertyThatBetterNeverExist = 1;
checkPropPresent("somePropertyThatBetterNeverExist", objList, true);

objList = [ HTMLElement.prototype,
            document.createElement("noSuchElementName"),
            document.body ]
checkPropPresent("someOtherPropertyThatBetterNeverExist", objList, false);
HTMLElement.prototype.someOtherPropertyThatBetterNeverExist = 1;
checkPropPresent("someOtherPropertyThatBetterNeverExist", objList, true);

</script>
</pre>
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