gecko-dev/content/base/test/test_bug693615.html

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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=693615
-->
<head>
<title>Test for Bug 693615</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=693615">Mozilla Bug 693615</a>
<p id="display"></p>
<div id="content" style="display: none">
</div>
<pre id="test">
<script type="application/javascript">
/** Test for Bug 693615 **/
/*
The following code tests if calling the DOM method Node::lookupNamespaceURI
directly (with quickstubs) and through XPCOM leads to the same result.
*/
var content = document.getElementById("content");
// called directly (quickstubs)
var defaultNS = content.lookupNamespaceURI(null);
is(defaultNS, null, "direct access working");
// called via XPCOM
// deleting the method from the prototype forces the engine to go through XPCOM
var proto = Object.getPrototypeOf(content);
delete(proto.lookupNamespaceURI);
var wrapperNS = content.lookupNamespaceURI(null);
is(wrapperNS, null, "access through XPCOM working");
</script>
</pre>
</body>
</html>