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chromium/third_party/blink/web_tests/fast/multicol/span/sole-spanner-inside-div.html 

<!DOCTYPE html>
<p>You should see the word 'PASS' on a green background below, and no red.</p>
<div style="-webkit-columns:10; -webkit-column-gap:0; -webkit-column-rule:1px solid red; width:5em; background:green;">
    <div>
        <div style="-webkit-column-span:all;">PASS<br>&nbsp;</div>
    </div>
</div>