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diff --git a/js/xpconnect/tests/mochitest/test_bug585745.html b/js/xpconnect/tests/mochitest/test_bug585745.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=585745
+-->
+<head>
+ <title>Test for Bug 585745</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=585745">Mozilla Bug 585745</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 585745 **/
+
+ var a = document.createElementNS("http://www.w3.org/1998/Math/MathML", 'mrow');
+ var b = document.createElementNS("http://www.w3.org/1999/xhtml", 'span');
+ var htmlProto = Object.getPrototypeOf(b);
+ var mathMLProto = Object.getPrototypeOf(a);
+ // XXXbz once bug 560072 is fixed, we should be able to use
+ // getOwnPropertyDescriptor here.
+ Object.defineProperty(mathMLProto, "style", {
+ get: htmlProto.__lookupGetter__("style"),
+ });
+
+ var threw = false;
+ try {
+ a.style;
+ } catch(e) {
+ threw = true;
+ }
+ is(threw, true,
+ "Getting .style off a mathml element should throw in this case");
+</script>
+</pre>
+</body>
+</html>