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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<style type="text/css">
#parent {
min-height: 100px;
margin-bottom: 20px;
background-color: lightgreen;
}
#last-child {
display: none;
height: 110px;
margin-bottom: 10px;
background-color: green;
}
#separator {
height: 20px;
background-color: blue;
}
</style>
<script type="text/javascript">
function test() {
document.getElementById('last-child').style.display = 'block';
document.documentElement.removeAttribute('class');
}
document.addEventListener('MozReftestInvalidate', test);
</script>
</head>
<body>
<div id="parent">
<div id="last-child"></div>
</div>
<div id="separator"></div>
</body>
</html>