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<!DOCTYPE html>
<html class="reftest-wait">
<head>
<style>
div {
  width: 200px;
  height: 200px;
  position:relative;
  will-change:transform;
}
#one {
  top:120px;
  background-color:blue;
}
#two {
  top: -200px;
  left: 100px;
  background-color:green;
}
#three {
  top: -180px;
  left: 100px;
  background-color:red;
  z-index: 1;
}
</style>
</head>
<body>
  <div id="one"></div>
  <div id="two"></div>
  <div id="three"></div>
</body>
<script>
function doTest() {
  document.getElementById("three").style.zIndex = -1;
  document.documentElement.removeAttribute("class");
}

window.addEventListener("MozReftestInvalidate", doTest);
</script>
</html>