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Test Info:

<!DOCTYPE html>
<html>
<head>
<style type="text/css">
.separator {
height: 20px;
background-color: green;
}
#parent {
background-color: lime;
margin-bottom: 50px;
}
#float {
float: left;
width: 100px; height: 100px;
background-color: blue;
}
#clear {
clear: left;
margin-top: 40px;
margin-bottom: 10px;
}
#clear-sibling {
margin-top: 20px;
margin-bottom: 30px;
}
</style>
</head>
<body>
<div class="separator"></div>
<div id="parent">
<div id="float"></div>
<div id="clear"></div>
<div id="clear-sibling"></div>
</div>
<div class="separator"></div>
</body>
</html>