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diff --git a/dom/html/test/test_bug561640.html b/dom/html/test/test_bug561640.html
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+++ b/dom/html/test/test_bug561640.html
@@ -0,0 +1,72 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=561640
+-->
+<head>
+  <title>Test for Bug 561640</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <style>
+    input, textarea { background-color: rgb(0,0,0) !important; }
+    :-moz-any(input,textarea):valid   { background-color: rgb(0,255,0) !important; }
+    :-moz-any(input,textarea):invalid { background-color: rgb(255,0,0) !important; }
+  </style>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=561640">Mozilla Bug 561640</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 561640 **/
+
+var elements = [ 'input', 'textarea' ];
+var content = document.getElementById('content');
+
+function checkValid(elmt)
+{
+  ok(!elmt.validity.tooLong, "element should not be too long");
+  is(window.getComputedStyle(elmt, null).getPropertyValue('background-color'),
+     "rgb(0, 255, 0)", ":valid pseudo-class should apply");
+}
+
+function checkInvalid(elmt)
+{
+  todo(elmt.validity.tooLong, "element should be too long");
+  todo_is(window.getComputedStyle(elmt, null).getPropertyValue('background-color'),
+          "rgb(255, 0, 0)", ":invalid pseudo-class should apply");
+}
+
+for (var elmtName of elements) {
+  var elmt = document.createElement(elmtName);
+  content.appendChild(elmt);
+
+  if (elmtName == 'textarea') {
+    elmt.textContent = 'foo';
+  } else {
+    elmt.setAttribute('value', 'foo');
+  }
+  elmt.maxLength = 2;
+  checkValid(elmt);
+
+  elmt.value = 'a';
+  checkValid(elmt);
+
+  if (elmtName == 'textarea') {
+    elmt.textContent = 'f';
+  } else {
+    elmt.setAttribute('value', 'f');
+  }
+  elmt.value = 'bar';
+  checkInvalid(elmt);
+
+  content.removeChild(elmt);
+}
+
+</script>
+</pre>
+</body>
+</html>