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<!DOCTYPE HTML>
<html class="reftest-wait">
<body>
<div class="reftest-no-paint" style="background-color: rgba(255, 0, 0, 0.5); width:100px; height:100px;" >
</div>
<script type="application/javascript">

function doTest() {
  document.body.style.background = "black";
  document.documentElement.removeAttribute("class");
}
document.addEventListener("MozReftestInvalidate", doTest);
</script>
</body>
</html>