<!DOCTYPE HTML>
<html class="reftest-wait">
<head>
<style>
.test {
  position:fixed;
  display:none;
  width:100px; height:100px;
  background:yellow;
}
.doTest .test {
  display:block;
}
</style>
</head>
<body>
<div style="transform:translate(10px,0); overflow:scroll; width:200px; height:200px;">
  <div class="test"></div>
</div>
<script>
function doTest() {
  document.documentElement.setAttribute("class", "doTest");
}
window.addEventListener("MozReftestInvalidate", doTest, false);
</script>
</body>
</html>