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diff --git a/dom/tests/mochitest/bugs/test_bug850517.html b/dom/tests/mochitest/bugs/test_bug850517.html
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+++ b/dom/tests/mochitest/bugs/test_bug850517.html
@@ -0,0 +1,47 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=850517
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 850517</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 live updating of named child resolution. **/
+ SimpleTest.waitForExplicitFinish();
+
+ function go() {
+ var ifrA = $('a');
+ var ifrB = $('b');
+ var sb = new SpecialPowers.Cu.Sandbox('http://www.example.com');
+ sb.win = window;
+ sb.childA = ifrA.contentWindow;
+ sb.childB = ifrB.contentWindow;
+ SpecialPowers.setWrapped(sb, 'is', SpecialPowers.wrap(is));
+ SpecialPowers.setWrapped(sb, 'ok', SpecialPowers.wrap(ok));
+ is(window.theoneandonly.frameElement, ifrA, "Named child resolution works");
+ SpecialPowers.Cu.evalInSandbox('is(win.theoneandonly, childA, "Named child resolution works via Xray");', sb);
+ ifrA.removeAttribute('name');
+ is(typeof window.theoneandonly, 'undefined', "Revocation works");
+ SpecialPowers.Cu.evalInSandbox('try { win.theoneandonly; ok(false, "Should have thrown"); } ' +
+ 'catch (e) {ok(!!/denied/.exec(e) && !!/theoneandonly/.exec(e), "Revocation works via Xray");};', sb);
+ ifrB.setAttribute('name', 'theoneandonly');
+ is(window.theoneandonly.frameElement, ifrB, "Another mule kicking in the same old stall");
+ SpecialPowers.Cu.evalInSandbox('is(win.theoneandonly, childB, "Another mule via Xray");', sb);
+ SimpleTest.finish();
+ }
+
+ </script>
+</head>
+<body onload="go();">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=850517">Mozilla Bug 850517</a>
+<p id="display"></p>
+<iframe id="a" name="theoneandonly"></iframe>
+<iframe id="b"></iframe>
+<pre id="test">
+</pre>
+</body>
+</html>