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Test Info:

<!DOCTYPE HTML>
<html>
<head>
<style type="text/css">
#w:after {
content: "A";
display: block;
height: 0;
clear: both;
}
</style>
</head>
<body onload="document.getElementById('c').style.height = '20px';" style="width: 300px">
<div style="column-count: 2;"><div style="width: 200px; float: left;"><div id="c" style="padding-top: 30px;"></div></div><div style="padding: 10px 0pt;"><div><div id="w"><div style="display: list-item; float: left; margin-right: 100px;"></div></div><div style="height: 20px; display: inline-block;"></div></div></div></div>
</body>
</html>