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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<style type="text/css">
#block1 {
height: 20px;
margin-bottom: 30px;
background-color: green;
}
#margin-only {
margin-bottom: 10px;
}
#block2 {
height: 20px;
margin-top: 20px;
background-color: green;
}
</style>
<script type="text/javascript">
function test() {
document.getElementById('margin-only').style.marginTop = '40px';
document.documentElement.removeAttribute('class');
}
document.addEventListener('MozReftestInvalidate', test);
</script>
</head>
<body>
<div id="block1"></div>
<div id="margin-only"></div>
<div id="block2"></div>
</body>
</html>