<!DOCTYPE html>
<p>Test that margins on column content and margins on a spanner don't collapse.</p>
<p>There should be a blue square below.</p>
<div style="-webkit-columns:2; width:10em; background:blue;">
    <div style="height:1em; margin-bottom:4em;"></div>
    <div style="-webkit-column-span:all; margin:2.5em 0;"></div>
    <div style="height:1em; margin-top:4em;"></div>
</div>