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diff --git a/js/xpconnect/tests/mochitest/test_bug870423.html b/js/xpconnect/tests/mochitest/test_bug870423.html
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+++ b/js/xpconnect/tests/mochitest/test_bug870423.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=870423
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 870423</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 cross-scope instanceof. **/
+ SimpleTest.waitForExplicitFinish();
+
+ function go() {
+ var sowin = $('soifr').contentWindow;
+ var xowin = $('xoifr').contentWindow;
+
+ check(window, sowin, 'HTMLBodyElement', function(win) { return win.document.body; });
+ check(window, sowin, 'HTMLDocument', function(win) { return win.document; });
+ check(window, sowin, 'Window', function(win) { return win; });
+ check(window, sowin, 'Location', function(win) { return win.location; });
+
+ ok(xowin instanceof Window, "Cross-origin instanceof should work");
+ ok(xowin.location instanceof Location, "Cross-origin instanceof should work");
+
+ SimpleTest.finish();
+ }
+
+ function check(win1, win2, constructorName, getInstance) {
+ ok(getInstance(win1) instanceof win2[constructorName],
+ "Cross-Scope instanceof works: " + constructorName + ", " + win1.location + ", " + win2.location);
+ ok(getInstance(win2) instanceof win1[constructorName],
+ "Cross-Scope instanceof works: " + constructorName + ", " + win2.location + ", " + win1.location);
+ }
+
+ </script>
+</head>
+<body onload="go();">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=870423">Mozilla Bug 870423</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<iframe id="soifr" src="file_empty.html"></iframe>
+<iframe id="xoifr" src="http://example.org/tests/js/xpconnect/tests/mochitest/file_empty.html"></iframe>
+<pre id="test">
+</pre>
+</body>
+</html>