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chromium/third_party/blink/web_tests/fast/multicol/nested-with-padding.html 

<!DOCTYPE html>
<p>Below, the word "PASS" should be seen in white on a blue background.</p>
<div style="columns:3; column-fill:auto; column-gap:0; width:15em; height:20px; line-height:20px;">
    <div style="columns:2; column-fill:auto; column-gap:0; padding-top:20px; color:white; background:blue;">
        PASS
    </div>
</div>