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diff --git a/dom/tests/mochitest/bugs/test_bug848088.html b/dom/tests/mochitest/bugs/test_bug848088.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=848088
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 848088</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <script type="application/javascript">
+
+ /** Test for Bug 848088 **/
+
+function test(loopFor, setExpandoAt)
+{
+ var list = document.getElementsByTagName("audio");
+ delete list.length;
+ var shouldHaveExpando = false;
+ var realLength = list.length;
+ for (var i = 0; i < loopFor; ++i) {
+ if (i == setExpandoAt) {
+ // Add an expando that shadows.
+ Object.defineProperty(list, "length", { value: "a" });
+ shouldHaveExpando = true;
+ }
+ var hasExpando = (list.length != realLength);
+ if (shouldHaveExpando != hasExpando) {
+ return false;
+ }
+ }
+ return true;
+}
+
+ok(test(200000, 100000), "Correctly detected expando on DOM list object");
+
+ </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=848088">Mozilla Bug 848088</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>