<!doctype html>
<meta charset="utf-8">
<title>CSS Test Reference</title>
<style>
  body {
    margin: 0;
  }
  .hidden {
    width: 100px;
    height: 100px;
    margin-left: 100px;
    margin-top: 200px;
  }
  .fixedpos {
    position: fixed;
    top: 100px;
    left: 100px;
    background: green;
    height: 100px;
    width: 100px;
  }
  .spacer {
    height: 2000px;
  }
</style>
<div class="hidden"></div>
<div class="fixedpos"></div>
<div class="spacer"></div>
<script>
  window.onload = function() { window.scrollTo(0, 100); };
</script>