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diff --git a/dom/html/test/test_bug402680.html b/dom/html/test/test_bug402680.html
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+++ b/dom/html/test/test_bug402680.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=402680
+-->
+<head>
+  <title>Test for Bug 402680</title>
+  <script>
+    var activeElementIsNull = (document.activeElement == null);
+  </script>
+  <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=402680">Mozilla Bug 402680</a>
+<p id="display"></p>
+<div id="content">
+  <input type="text">
+  <textarea></textarea>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 402680 **/
+
+ok(activeElementIsNull,
+   "Before document has body, active element should be null");
+
+function testActiveElement() {
+  ok(document.body == document.activeElement,
+     "After page load body element should be the active element!");
+  var input = document.getElementsByTagName("input")[0];
+  input.focus();
+  ok(document.activeElement == input,
+     "Input element isn't the active element!");
+  var textarea = document.getElementsByTagName("textarea")[0];
+  textarea.focus();
+  ok(document.activeElement == textarea,
+     "Textarea element isn't the active element!");
+  SimpleTest.finish();
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(testActiveElement);
+
+</script>
+</pre>
+</body>
+</html>
+