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diff --git a/dom/tests/mochitest/bugs/test_bug377539.html b/dom/tests/mochitest/bugs/test_bug377539.html
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+++ b/dom/tests/mochitest/bugs/test_bug377539.html
@@ -0,0 +1,55 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=377539
+-->
+<head>
+ <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
+ <title>Testcase for bug 377539</title>
+
+ <script type="text/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=377539">Mozilla Bug 377539</a>
+
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+
+<script type="text/javascript">
+var sw;
+var child_sw = -1;
+
+function test(){
+ var t = '<div style="display: none;"><iframe onload="doChecks()" src="data:text/html,<body><scr'+'ipt>try {parent.child_sw=screen.width}catch(e){}</scr'+'ipt>"></iframe></div>';
+ var div = document.createElement('div');
+ div.innerHTML = t;
+ document.getElementsByTagName('body')[0].appendChild(div);
+}
+
+try {
+ sw = screen.width;
+} catch (e) {
+ sw = -1;
+}
+
+</script>
+
+<pre id="test">
+<script class="testbody" type="text/javascript">
+function doChecks() {
+ isnot(sw, -1, "screen.width threw an exception");
+ is(child_sw, sw, "iframe got wrong screen.width");
+ SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+
+test();
+
+</script>
+</pre>
+</body>
+</html>