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Test Info:

<!DOCTYPE HTML>
<html class="reftest-wait">
<body>
<div id="first" style="position:absolute; width: 200px; height: 200px; background-color:blue; z-index: 1"></div>
<div style="position:absolute; left: 400px; width: 200px; height: 200px; background-color:green; z-index: 2"></div>
<div id="overlay" style="position:absolute; top: 100px; width: 600px; height: 200px; background-color:orange; z-index: 10"></div>
</body>
<script>
function doTest2() {
document.getElementById("overlay").style.zIndex= 11;
document.documentElement.removeAttribute('class');
}
function doTest() {
document.getElementById("first").style.zIndex = 3;
setTimeout(doTest2, 1000);
}
window.addEventListener("MozReftestInvalidate", doTest);
</script>
</html>