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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=637644
+-->
+<head>
+ <title>Test for Bug 637644</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script src="/tests/SimpleTest/WindowSnapshot.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=637644">Mozilla Bug 637644</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 637644 */
+SimpleTest.waitForExplicitFinish();
+
+addLoadEvent(function() {
+var win1 = window.open("", "", "height=500,width=500");
+win1.document.body.textContent = "Should show";
+
+var windowsLoaded = 0;
+
+window.onmessage = async function(ev) {
+ is(ev.data, "loaded", "Message should be 'loaded'");
+ if (++windowsLoaded == 2) {
+ var one = await snapshotWindow(win1);
+ var two = await snapshotWindow(win2);
+ var three = await snapshotWindow(win3);
+ win1.close();
+ win2.close();
+ win3.close();
+ ok(compareSnapshots(one, two, true)[0], "Popups should look identical");
+ ok(compareSnapshots(one, three, false)[0], "Popups should not look identical");
+
+ SimpleTest.finish();
+ }
+};
+
+var win2 = window.open("file_bug637644_1.html", "", "height=500,width=500");
+var win3 = window.open("file_bug637644_2.html", "", "height=500,width=500");
+});
+</script>
+</pre>
+</body>
+</html>