<!DOCTYPE html>
<style>
    .col { width:1em; float:left; background:lime; }
</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="col">P</div>
<div class="col">A</div>
<div class="col">S</div>
<div class="col">S</div>