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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
document.documentElement.offsetHeight;
document.getElementById("outer").lastChild.data = "Y";
document.documentElement.offsetHeight;
}
</script>
</head>
<body onload="boom();">
<div id="outer" style="column-width: 1px;"><div style="column-width: 1px;"><div style="height: 50px;"></div><div style="float: left; height: 466px;"></div><div></div></div>X</div>
</body>
</html>