test_protochains.html

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<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=817420

-->

<head>

  <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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<body>

<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">

</div>

<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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