layout/reftests/margin-collapsing/block-sibling-1a.html


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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
#a {
 height: 20px;
 background-color: green;
 margin-bottom: 10px;
}
#b {
 height: 20px;
 background-color: green;
 margin-top: 20px;
}
</style>
</head>
<body>
<div id="a"></div>
<div id="b"></div>
</body>
</html>