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Test Info:

<!DOCTYPE HTML>
<html class="reftest-wait">
<head>
<style>
#d2 {
opacity:0;
transition:all 0.2s;
position:absolute;
}
#d2.active {
opacity:1;
}
#image {
position:fixed;
width:100%;
height:100%;
background:blue;
left:0;
top:0;
}
</style>
</head>
<body>
<div id="d2" class="active">
<div id="image"></div>
<h2>ABCDEFG</h2>
</div>
<script>
function doTest() {
d2.addEventListener("transitionend", function() {
document.documentElement.removeAttribute("class");
});
d2.classList.toggle("active");
}
window.addEventListener("MozReftestInvalidate", doTest);
</script>
</body>
</html>