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diff --git a/dom/events/test/test_bug1150308.html b/dom/events/test/test_bug1150308.html
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+++ b/dom/events/test/test_bug1150308.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1150308
+-->
+<head>
+  <title>Test for Bug 1150308</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<div id="host"><span id="distributeme">Foo</span></div>
+<script type="application/javascript">
+
+/** Test for Bug 1150308 **/
+SimpleTest.waitForExplicitFinish();
+
+SimpleTest.waitForFocus(function() {
+  var host = document.getElementById("host");
+  var shadow = host.createShadowRoot();
+  shadow.innerHTML = '<style>.bar:active { color: rgb(0, 255, 0); }</style><div class="bar" id="inner"><content></content></div>';
+  var inner = shadow.getElementById("inner");
+  var distributed = document.getElementById("distributeme");
+
+  is(window.getComputedStyle(inner).color, "rgb(0, 0, 0)", "The div inside the shadow root should not be active.");
+
+  synthesizeMouseAtCenter(distributed, { type: "mousedown" });
+
+  is(window.getComputedStyle(inner).color, "rgb(0, 255, 0)", "Div inside shadow root should be active.");
+
+  synthesizeMouseAtCenter(distributed, { type: "mouseup" });
+
+  is(window.getComputedStyle(inner).color, "rgb(0, 0, 0)", "Div inside shadow root should no longer be active.");
+
+  SimpleTest.finish();
+});
+
+</script>
+</body>
+</html>