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chromium/third_party/blink/web_tests/fast/multicol/nested-balanced-inner-with-many-breaks-2.html 

<!DOCTYPE html>
<p>The word "PASS" should be seen below.</p>
<div style="columns:3; column-gap:0; width:24em; line-height:20px; orphans:1; widows:1; background:yellow;">
    <br>
    <div>
        <div style="columns:2; column-gap:0;">
            <div style="height:1px;"></div>
            <div style="break-before:column;"></div>
            <div style="height:1px;"></div>
            <div style="break-before:column;"></div>
            <br><br><br><br>PASS
        </div>
    </div>
</div>