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Test Info:

<!DOCTYPE HTML>
<html class="reftest-wait">
<head>
<style type="text/css">
#rear {
width: 500px;
height: 1500px;
box-shadow: 0 0 71px #667;
display: block;
}
.cover {
position: absolute;
width: 520px;
height: 100px;
background: yellow;
}
</style>
<script>
function doTest() {
var es = document.getElementsByClassName("cover");
for (var i = 0; i < es.length; ++i) {
es[i].style.display = 'none';
}
document.documentElement.removeAttribute("class");
}
window.addEventListener("MozReftestInvalidate", doTest);
</script>
</head>
<body>
<div id="rear"></div>
<div class="cover" style="top:100px"></div>
<div class="cover" style="top:300px"></div>
</body>
</html>