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Test Info:

<html>
<head><style>
#colset { column-count: 1; }
#short { height: 10px; }
#tall { height: 100000px; }
</style></head>
<body>
<div id="colset">
<div id="short">
<div id="tall"></div>
</div>
</div>
</body>
</html>