gecko-dev/layout/reftests/margin-collapsing/block-html-html-1b-dyn.html

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HTML

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<style type="text/css">
html, body {
margin: 0; padding: 0;
}
html {
background-color: white;
margin: 20px 0;
}
div {
display: none;
background-color: green;
margin: 10px 0;
height: 100px;
}
</style>
<script type="text/javascript">
function test() {
document.getElementsByTagName('div')[0].style.display = 'block';
document.documentElement.removeAttribute('class');
}
document.addEventListener('MozReftestInvalidate', test);
</script>
</head>
<body>
<div></div>
</body>
</html>