<!DOCTYPE html>
<p>Check that the top margin on a block around a spanner inside an auto-filled multicol container
    isn't lost.</p>
<p>Below there should be a black square between two blue squares.</p>
<div style="float:left; width:200px; height:200px; background:blue;"></div>
<div style="float:left; width:200px; height:200px; background:black;"></div>
<div style="float:left; width:200px; height:200px; background:blue;"></div>