<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
   "http://www.w3.org/TR/html4/loose.dtd">

<html lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <title>Position fixed</title>
  <style type="text/css" media="screen">
    body {
      height: 1000px;
      width: 1000px;
    }
    #fixed {
      position: fixed;
      top: 0;
      left: 0;
      height: 100px;
      width: 100px;
      opacity: 0.8; /* makes this a compositing layer without assigning a transform */
      background-color: orange;
    }

    .box {
      height: 50px;
      width: 50px;
      background-color: green;
    }
    
    .compositing {
      -webkit-transform: translateZ(0);
    }
    
    p {
      position: absolute;
      left: 50px;
      top: 150px;
    }
  </style>
  <script type="text/javascript" charset="utf-8">
    window.addEventListener('load', function() {
      window.scrollBy(50, 50);
    }, false);
  </script>
</head>
<body>

<p>You should see a green square in the top left corner of an orange box.</p>
<div id="fixed">
  <div class="compositing box">
  </div>
</div>

</body>
</html>