<!DOCTYPE html>
<title>Auto margin-top and margin-bottom, non-auto everything else</title>
<link rel="author" title="Morten Stenshorne" href="mstensho@chromium.org">
<link rel="help" href="https://www.w3.org/TR/CSS22/visudet.html#abs-non-replaced-height">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="position:relative; width:100px; height:100px; background:red;">
  <div style="position:absolute; top:50%; bottom:50%; width:100px; height:100px; margin:auto; background:green;"></div>
</div>
