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chromium/third_party/blink/web_tests/fast/multicol/span/spanner-with-margin.html 

<!DOCTYPE html>
<p>Test that a spanner with margins that is inside another block that has more column content around it works as it should.</p>
<p>You should see the word 'PASS' five times below (letter spacing will vary):</p>
<div style="-webkit-columns:4; -webkit-column-gap:0; width:4em;">
    P<br>P<br>A<br>A<br>S<br>S<br>S<br>S
    <div>
        <div style="-webkit-column-span:all; margin:2em;">PASS<br>&nbsp;</div>
    </div>
    P<br>P<br>A<br>A<br>S<br>S<br>S<br>S
</div>