<!DOCTYPE html>

<html>
<head>
  <style>
    .fixed {
      position: fixed;
      width: 10px;
      height: 10px;
      background-color: silver;
    }
  </style>

  <script type="text/javascript">
        if (window.testRunner)
            testRunner.dumpAsText();

        function doTest()
        {
            if (window.internals) {
                document.getElementById('scrollingTree').innerText = internals.scrollingStateTreeAsText();
            }
        }
        window.addEventListener('load', doTest, false);
  </script>
</head>

<body>
  <div style="height: 1000px">
    <pre id="scrollingTree"></pre>
  </div>

  <div class="fixed" style="top: -100px"></div>
  <div class="fixed" style="top: 0px; left: 1000px"></div>

  <div class="fixed" style="top: 0px; left: 0px"></div>
</body>
</html>