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Test Info:

<!DOCTYPE html>
<html>
<head>
<style type="text/css">
#a {
float: left;
position: relative;
padding: 331890106943cm 0;
}
#b {
position: absolute;
top: 100%;
}
</style>
</head>
<body>
<div id="a"><div id="b"></div></div>
</body>
</html>