<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">

<style type="text/css">
#parent {
  width: 400px;
  height: 400px;
  transform-style: flat;
}

#child {
  width: 400px;
  height: 400px;
  overflow: scroll;
}

.box {
  width: 400px;
  height: 300px;
  background-color: red;
}
</style>

</head>
<body>

<div id="parent">
  <div id="child">
    <div class="box"></div>
    <div class="box"></div>
  </div>
</div>

<script>
function doTest() {
  document.documentElement.removeAttribute("class");
  document.getElementById("child").scrollTop = 200;
}
window.addEventListener("MozReftestInvalidate", doTest);
</script>

</body>
</html>