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diff --git a/js/xpconnect/tests/mochitest/test_bug691059.html b/js/xpconnect/tests/mochitest/test_bug691059.html
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index 0000000000..b00da02b0d
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+++ b/js/xpconnect/tests/mochitest/test_bug691059.html
@@ -0,0 +1,59 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=691059
+-->
+<head>
+  <title>Test for Bug 691059</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=691059">Mozilla Bug 691059</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+
+/** Test for Bug 691059 **/
+
+function f() {}
+
+function testEventTarget(obj) {
+  obj.onmouseenter = f;
+  is(obj.onmouseenter, f,
+     "onmouseenter should be settable");
+  obj.onmouseleave = f;
+  is(obj.onmouseleave, f,
+     "onmouseenter should be settable");
+}
+
+function testInterface(obj) {
+  try {
+    obj.prototype.onmouseenter = f;
+    is("onmouseenter" in obj, false,
+       "setting <Interface>.prototype.onmouseenter has no effect on the " +
+       "non-existent <Interface>.onmouseenter");
+    obj.prototype.onmouseleave = f;
+    is("onmouseleave" in obj, false,
+       "setting <Interface>.prototype.onmouseleave has no effect on the " +
+       "non-existent <Interface>.onmouseleave");
+  } catch(ex) {
+    ok(false, ex);
+  }
+}
+
+testEventTarget(window);
+testEventTarget(document);
+testEventTarget(document.documentElement);
+
+testInterface(Document);
+testInterface(HTMLElement);
+
+</script>
+</pre>
+</body>
+</html>