<!DOCTYPE html>
<html>
  <head>
    <title>CSS Reftest Reference</title>
    <link rel="author" title="Clint Talbert" href="mailto:ctalbert@mozilla.com">
    <link rel="author" title="Aryeh Gregor" href="mailto:ayg@aryeh.name">
    <style>
      body {
        margin: 0;
      }

      div {
        background: green;
        width: 50px;
        height: 50px;
        margin: 25px;
      }
    </style>
  </head>
  <body>
    <div></div>
  </body>
</html>