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Test Info:

<!DOCTYPE html>
<html>
<head>
<style type="text/css">
#abs {
position: absolute;
left: 20px; top: 20px;
width: 100px;
background-color: red;
}
#parent {
margin-bottom: 100px;
}
#zero-height {
margin-bottom: 70px;
height: 0;
}
#child-of-zero-height {
height: 100px; background: green;
}
</style>
</head>
<body>
<div id="abs">
<div id="parent">
<div id="zero-height">
<div id="child-of-zero-height"></div>
</div>
</div>
</div>
</body>
</html>