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-rw-r--r--dom/tests/mochitest/bugs/test_protochains.html59
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diff --git a/dom/tests/mochitest/bugs/test_protochains.html b/dom/tests/mochitest/bugs/test_protochains.html
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+++ b/dom/tests/mochitest/bugs/test_protochains.html
@@ -0,0 +1,59 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=817420
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 817420</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<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>
+</body>
+</html>