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chromium/third_party/blink/web_tests/fast/multicol/nested-auto-height.html 

<!DOCTYPE html>
<style>
    .mc { -webkit-columns:2; -webkit-column-gap:0; orphans:1; widows:1; }
</style>
<p>Basic test for multicol inside multicol, where the inner multicol crosses column boundaries in
    the outer multicol, so that it has to establish multiple rows / fragmentation groups.</p>
<p>Below, the word "PASS" should be seen, with large letter spacing on a lime background. No red should be seen.</p>
<div class="mc" style="width:4em; background:red;">
    <div class="mc" style="background:lime;">
        P<br>A<br>S<br>S
    </div>
</div>