gecko-dev/layout/reftests/margin-collapsing/block-abs-pos-1-ref.html

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HTML

<!DOCTYPE html>
<html>
<head>
<!-- The interaction of "static position" with margin collapsing is not well
defined. In CSS 2.1, there is no hint regarding the expected rendering,
so this test may turn out invalid. -->
<style type="text/css">
#a {
height: 20px;
background-color: red;
margin-bottom: 20px;
}
#b {
height: 20px;
background-color: green;
}
#c {
width: 20px; height: 20px;
background-color: blue;
position: relative;
top: -10px;
}
</style>
</head>
<body>
<div id="a"></div>
<div id="b"></div>
<div id="c"></div>
</body>
</html>