chromium/third_party/blink/web_tests/fast/multicol/span/fill-after-spanner-exact-fit.html

<!DOCTYPE html>
<p>Inside the dashed box below you should see the word "PASS" twice, then a small blue box,
    then the word "PASS" three times. Large letter spacing is fine.</p>
<div style="width:4em; margin:20px; border:2px dashed salmon; padding:10px; -webkit-columns:4; column-fill:auto; height:13.5em; line-height:2em; orphans:1; widows:1;">
    P<br>P<br>A<br>A<br>S<br>S<br>S<br>S
    <div style="-webkit-column-span:all; width:0.5em; height:2em; margin:auto; background:blue;"></div>
    P<br>P<br>P<br>A<br>A<br>A<br>S<br>S<br>S<br>S<br>S<br>S
</div>