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Test Info:

<!DOCTYPE HTML>
<html class="reftest-wait">
<head>
<style>
#a {
display: block;
opacity:1;
overflow:hidden;
width: 100px;
height: 100px;
background-color: lime;
}
</style>
</head>
<body>
<span id="a"></span>
<script>
function doe() {
document.getElementById('a').style.opacity = '0';
document.documentElement.removeAttribute("class");
}
document.addEventListener("MozReftestInvalidate", doe);
</script>
</body>
</html>