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diff --git a/dom/events/test/test_bug517851.html b/dom/events/test/test_bug517851.html
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+++ b/dom/events/test/test_bug517851.html
@@ -0,0 +1,122 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=517851
+-->
+<head>
+  <title>Test for Bug 517851</title>
+  <script src="/tests/SimpleTest/SimpleTest.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=517851">Mozilla Bug 517851</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <iframe id="subframe"></iframe>
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 517851 **/
+SimpleTest.waitForExplicitFinish();
+
+addLoadEvent(function() {
+window.handledCount = 0;
+window.testReturnValue = false;
+var target = document.createElement("div");
+var target2 = $("subframe").contentDocument.body;
+target.setAttribute("onerror", "++window.handledCount; return window.testReturnValue;");
+target2.setAttribute("onerror", "++window.parent.handledCount; return window.parent.testReturnValue;");
+target.setAttribute("onmouseover", "++window.handledCount; return window.testReturnValue;");
+target.setAttribute("onbeforeunload", "++window.handledCount; return window.testReturnValue;");
+target2.setAttribute("onbeforeunload", "++window.parent.handledCount; return window.parent.testReturnValue;");
+target.setAttribute("onmousemove", "++window.handledCount; return window.testReturnValue;");                     
+
+var e = new ErrorEvent("error", {bubbles: true, cancelable: true});
+window.testReturnValue = true;
+is(target.dispatchEvent(e), window.testReturnValue,
+   "error event should not have reverse return value handling on div!");
+is(handledCount, 1, "Wrong event count!");
+window.testReturnValue = false;
+is(target.dispatchEvent(e), window.testReturnValue,
+   "error event should not have reverse return value handling on div (2)!");
+is(handledCount, 2, "Wrong event count!");
+
+var e = new ErrorEvent("error", {bubbles: true, cancelable: true});
+window.testReturnValue = false;
+is(target2.dispatchEvent(e), !window.testReturnValue,
+   "error event should have reverse return value handling!");
+is(handledCount, 3, "Wrong event count!");
+window.testReturnValue = true;
+is(target2.dispatchEvent(e), !window.testReturnValue,
+   "error event should have reverse return value handling (2)!");
+is(handledCount, 4, "Wrong event count!");
+
+e = document.createEvent("MouseEvent");
+e.initEvent("mouseover", true, true);
+window.testReturnValue = true;
+is(target.dispatchEvent(e), window.testReturnValue,
+   "mouseover event should not have reverse return value handling!");
+is(handledCount, 5, "Wrong event count!");
+window.testReturnValue = false;
+is(target.dispatchEvent(e), window.testReturnValue,
+   "mouseover event should not have reverse return value handling (2)!");
+is(handledCount, 6, "Wrong event count!");
+
+e = document.createEvent("BeforeUnloadEvent");
+e.initEvent("beforeunload", true, true);
+window.testReturnValue = true;
+is(target.dispatchEvent(e), true,
+   "beforeunload event on random element should not be prevented!");
+is(handledCount, 6, "Wrong event count; handler should not have run!");
+is(target2.dispatchEvent(e), false,
+   "beforeunload event should be prevented!");
+is(handledCount, 7, "Wrong event count!");
+window.testReturnValue = false;
+is(target.dispatchEvent(e), false,
+   "beforeunload event on random element should be prevented because the event was already cancelled!");
+is(handledCount, 7, "Wrong event count; handler should not have run! (2)");
+
+e = document.createEvent("BeforeUnloadEvent");
+e.initEvent("beforeunload", true, true);
+window.testReturnValue = false;
+is(target.dispatchEvent(e), true,
+   "beforeunload event on random element should not be prevented (2)!");
+is(handledCount, 7, "Wrong event count; handler should not have run! (2)");
+
+is(target2.dispatchEvent(e), false,
+   "beforeunload event should be prevented (2)!");
+is(handledCount, 8, "Wrong event count!");
+
+// Create normal event for beforeunload.
+e = document.createEvent("Event");
+e.initEvent("beforeunload", true, true);
+window.testReturnValue = true;
+is(target.dispatchEvent(e), true,
+   "beforeunload event shouldn't be prevented (3)!");
+is(handledCount, 8, "Wrong event count: handler should not have run(3)!");
+is(target2.dispatchEvent(e), true,
+   "beforeunload event shouldn't be prevented (3)!");
+is(handledCount, 9, "Wrong event count!");
+
+e = document.createEvent("MouseEvent");
+e.initEvent("mousemove", true, true);
+window.testReturnValue = true;
+is(target.dispatchEvent(e), window.testReturnValue,
+   "mousemove event shouldn't have reverse return value handling!");
+is(handledCount, 10, "Wrong event count!");
+window.testReturnValue = false;
+is(target.dispatchEvent(e), window.testReturnValue,
+   "mousemove event shouldn't have reverse return value handling (2)!");
+is(handledCount, 11, "Wrong event count!");
+
+// Now unhook the beforeunload handler in the subframe, so we don't prompt to
+// unload.
+target2.onbeforeunload = null;
+
+SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>