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<!DOCTYPE html>
<html class="reftest-wait">
<head>
 <style type="text/css">
 html, body {
  margin: 0; padding: 0;
 }
 html {
  background-color: white;
  margin: 10px 0;
 }
 body {
  background-color: red;
  margin: 20px 0;
 }
 div {
  display: none;
  background-color: green;
  margin: 40px 0;
  height: 100px;
 }
 </style>
 <script type="text/javascript">
 function test() {
  document.getElementsByTagName('div')[0].style.display = 'block';
  document.documentElement.removeAttribute('class');
 }
 document.addEventListener('MozReftestInvalidate', test);
 </script>
</head>
<body>
<div></div>
</body>
</html>