layout/reftests/margin-collapsing/block-xhtml-root-1a.xhtml


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<root>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
 <style type="text/css">
 root, html {
  display: block;
  margin: 0; padding: 0;
 }
 root {
  margin: 20px 0;
 }
 html {
  background-color: green;
  margin: 10px 0;
  height: 100px;
 }
 </style>
</head>
</html>
</root>