<!DOCTYPE html>
<html>
<body onload="document.documentElement.offsetHeight; document.getElementById('x').style.position = 'relative';">
<div style="-moz-column-width: 200px; -moz-column-fill: auto; height: 200px;">
<div style="height: 150px;"></div>
<div style="float: left; height: 150px; width: 200px;"></div>
<div>
<div id="x" style="float: left; height: 150px; width: 200px;"></div>
</div>
</div>
</body>
</html>