<!DOCTYPE html>
<html class="reftest-wait">
<body>
<div id="d" style="opacity:0.9">HELLO</div>
<script>
function finishTest() {
  var d = document.getElementById("d");
  d.style.opacity = 0.1;

  document.documentElement.removeAttribute("class");
}
window.addEventListener("MozReftestInvalidate", finishTest, false);
</script>
</body>
</html>