<!DOCTYPE html>
<p>Relayout an aboslutely positioned object whose containing block is a column-span:all object.</p>
<p>There should be a green <em>square</em> below, and no red.</p>
<div style="-webkit-columns:3;">
    <div style="position:relative; -webkit-column-span:all; width:10em; height:10em; background:red;">
        <div id="elm" style="position:absolute; height:10em; background:green;"></div>
    </div>
</div>
<script>
    onload = function() {
        document.body.offsetTop;
        document.getElementById('elm').style.width = '10em';
    }
</script>
