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Test Info:

<html>
<head>
<style type="text/css">
#colset {
height: 2in;
column-count: 3;
}
#container {
position: relative;
}
#overflow {
position: absolute;
height: 5in;
}
</style>
</head>
<body onload="document.getElementById('container').style.counterIncrement = 'foo';">
<div id="colset"><div id="container"><div id="overflow"></div></div></div>
</body>
</html>