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diff --git a/dom/bindings/test/test_domProxyArrayLengthGetter.html b/dom/bindings/test/test_domProxyArrayLengthGetter.html
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+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1221421
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 1221421</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <script type="text/javascript">
+
+ var x = document.documentElement.style;
+ x.__proto__ = [1, 2, 3];
+
+ var res = 0;
+ for (var h = 0; h < 5000; ++h) {
+ res += x.length;
+ }
+ is(res, 15000, "length getter should return array length");
+
+ </script>
+</head>
+
+<body>
+ <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1221421">Mozilla Bug 1221421</a>
+</body>
+</html>