<!DOCTYPE html>
<script>
    onload = function() {
        var elm = document.getElementById('elm');
        elm.offsetTop; // trigger layout
        elm.style.webkitColumnSpan = 'none';
    }
</script>
<p>Test changing a spanner in the middle of column content to a regular block.</p>
<p>You should see the word 'PASS' below, with large letter spacing:</p>
<div style="-webkit-columns:4; -webkit-column-gap:0; width:4em;">
    P
    <div id="elm" style="-webkit-column-span:all; column-span:all;">A</div>
    S<br>S
</div>