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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<head>
<style type="text/css">
fieldset {
height: 20px;
padding: 0;
border: none;
background-color: green;
}
#top {
margin: 0 0 20px;
}
#middle {
margin: 0;
}
#bottom {
margin: 20px 0 0;
}
</style>
<script type="text/javascript">
function test() {
document.getElementById('middle').style.margin = '20px 0';
document.documentElement.removeAttribute('class');
}
document.addEventListener('MozReftestInvalidate', test);
</script>
</head>
<body>
<fieldset id="top"></fieldset>
<fieldset id="middle"></fieldset>
<fieldset id="bottom"></fieldset>
</body>
</html>