<!DOCTYPE html>
<p>Inside the dashed box below you should see the word "PASS", then a small blue box, then
    the word "PASS" again. Large letter spacing is fine.</p>
<div style="width:4em; margin:20px; border:2px dashed salmon; padding:10px; -webkit-columns:4; column-fill:auto; orphans:1; widows:1;">
    P<br>A<br>S<br>S
    <div style="-webkit-column-span:all; width:0.5em; height:1em; margin:auto; background:blue;"></div>
    P<br>A<br>S<br>S
</div>