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diff --git a/dom/plugins/test/mochitest/test_instance_unparent1.html b/dom/plugins/test/mochitest/test_instance_unparent1.html
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+<!DOCTYPE html>
+<html>
+<head>
+ <title>Test removing an instance's DOM node</title>
+ <script type="text/javascript" src="/MochiKit/packed.js"></script>
+ <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script type="text/javascript" src="plugin-utils.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body onload="startTest()">
+ <script type="application/javascript;version=1.8">
+ SimpleTest.waitForExplicitFinish();
+ setTestPluginEnabledState(SpecialPowers.Ci.nsIPluginTag.STATE_ENABLED);
+
+ const MAX_ATTEMPTS = 50;
+ var attempts = 0;
+ var destroyed = false;
+ function onDestroy() {
+ destroyed = true;
+ }
+
+ function checkPluginAlreadyDestroyed() {
+ // We may need to retry a few times until the plugin stop event makes
+ // its way through the event queue.
+ if (attempts < MAX_ATTEMPTS && !destroyed) {
+ ++attempts;
+ SimpleTest.executeSoon(checkPluginAlreadyDestroyed);
+ } else {
+ info("Number of retry attempts: " + attempts);
+ is(destroyed, true, "Plugin instance should have been destroyed.");
+ SimpleTest.finish();
+ }
+ }
+
+ function startTest() {
+ var p1 = document.getElementById('plugin1');
+ var d1 = document.getElementById('div1');
+
+ p1.callOnDestroy(onDestroy);
+ d1.removeChild(p1);
+ SimpleTest.executeSoon(checkPluginAlreadyDestroyed);
+ }
+ </script>
+
+ <p id="display"></p>
+
+ <div id="div1">
+ <embed id="plugin1" type="application/x-test" width="200" height="200"></embed>
+ </div>
+</body>
+</html>