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diff --git a/dom/html/test/test_bug605124-1.html b/dom/html/test/test_bug605124-1.html
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+++ b/dom/html/test/test_bug605124-1.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=605124
+-->
+<head>
+  <title>Test for Bug 605124</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=605124">Mozilla Bug 605124</a>
+<p id="display"></p>
+<div id="content">
+  <form>
+    <textarea required></textarea>
+    <input required>
+    <select required></select>
+    <button type='submit'></button>
+  </form>
+
+  <table>
+    <form>
+    <tr>
+      <textarea required></textarea>
+      <input required>
+      <select required></select>
+      <button type='submit'></button>
+    </tr>
+    </form>
+  </table>
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 605124 **/
+
+function checkPseudoClass(aElement, aExpected)
+{
+  is(aElement.matches(":user-invalid"), aExpected,
+     "matches(':user-invalid') should return " + aExpected + " for " + aElement);
+}
+
+var content = document.getElementById('content');
+var textarea = document.getElementsByTagName('textarea')[0];
+var input = document.getElementsByTagName('input')[0];
+var select = document.getElementsByTagName('select')[0];
+var button = document.getElementsByTagName('button')[0];
+var form = document.forms[0];
+
+checkPseudoClass(textarea, false);
+checkPseudoClass(input, false);
+checkPseudoClass(select, false);
+
+// Try to submit.
+button.click();
+checkPseudoClass(textarea, true);
+checkPseudoClass(input, true);
+checkPseudoClass(select, true);
+
+// No longer in the form.
+content.appendChild(textarea);
+content.appendChild(input);
+content.appendChild(select);
+checkPseudoClass(textarea, true);
+checkPseudoClass(input, true);
+checkPseudoClass(select, true);
+
+// Back in the form.
+form.appendChild(textarea);
+form.appendChild(input);
+form.appendChild(select);
+checkPseudoClass(textarea, true);
+checkPseudoClass(input, true);
+checkPseudoClass(select, true);
+
+/* Case when elements get orphaned. */
+var textarea = document.getElementsByTagName('textarea')[1];
+var input = document.getElementsByTagName('input')[1];
+var select = document.getElementsByTagName('select')[1];
+var button = document.getElementsByTagName('button')[1];
+var form = document.forms[1];
+
+// Try to submit.
+button.click();
+checkPseudoClass(textarea, true);
+checkPseudoClass(input, true);
+checkPseudoClass(select, true);
+
+// Remove the form.
+document.getElementsByTagName('table')[0].removeChild(form);
+checkPseudoClass(textarea, true);
+checkPseudoClass(input, true);
+checkPseudoClass(select, true);
+</script>
+</pre>
+</body>
+</html>