<!DOCTYPE html>
<p>Test changing the contents of a table cell, increasing column height</p>
<p>You should see the text "first column" once in the first column, and the text "second
    column" twice in the second column.</p>
<div style="width:511px; overflow:hidden; background:yellow;">
    <div style="float:left; width:255px;">
        first column
    </div>
    <div style="float:left; border-left:1px solid; padding-left:5px;">
        second column<br>
        second column
    </div>
</div>