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Test Info:
<!DOCTYPE html>
<html>
<head>
<!-- Without floats, no clearance applies, thus margin-top of #clear
should collapse with margin-bottom of its parent element. -->
<style type="text/css">
#parent {
margin-bottom: 10px;
}
.separator {
height: 20px;
background-color: green;
}
#clear {
clear: left;
margin-top: 20px;
}
</style>
</head>
<body>
<div id="parent">
<div class="separator"></div>
<div id="clear"></div>
</div>
<div class="separator"></div>
</body>
</html>