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diff --git a/dom/tests/mochitest/bugs/test_bug817476.html b/dom/tests/mochitest/bugs/test_bug817476.html
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+++ b/dom/tests/mochitest/bugs/test_bug817476.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=817476
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 817476</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=817476">Mozilla Bug 817476</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 817476 **/
+function getNewWindow() {
+  var ifr = document.createElement("iframe");
+  $("content").appendChild(ifr);
+  return ifr.contentWindow;
+}
+
+// Test getting .screen before .Screen
+var win = getNewWindow();
+is(Object.getPrototypeOf(win.screen), win.Screen.prototype,
+   "protos must match (1)");
+is(win.Screen.prototype.toString(), "[object Screen]",
+   "proto must be WebIDL (1)");
+
+// Test getting Screen before .screen
+var win = getNewWindow();
+is(win.Screen.prototype, Object.getPrototypeOf(win.screen),
+   "protos must match (2)");
+is(win.Screen.prototype.toString(), "[object Screen]",
+   "proto must be WebIDL (2)");
+
+</script>
+</pre>
+</body>
+</html>