<!-- webkit-test-runner [ useThreadedScrolling=false ] -->
<!DOCTYPE html>
<html>
<head>
  <style>
    #container {
      width: 200px;
      height: 200px;
      overflow: auto;
    }

    #content {
      width: 100px;
      height: 100px;
      background-color: yellow;
    }
  </style>

  <script type="text/javascript" charset="utf-8">
    if (window.testRunner)
      testRunner.dumpAsText();

    if (window.internals)
      window.internals.settings.setAcceleratedCompositingForOverflowScrollEnabled(true);

    function doTest()
    {
      document.body.offsetHeight;
      document.getElementById('content').style.height = '1000px';
      if (window.internals)
        document.getElementById('result').innerText = window.internals.nonFastScrollableRects().length ? "FAIL" : "PASS";
    }

    window.addEventListener('load', doTest, false);
  </script>
</head>

<body>
  <div id="container">
    <div id="content"></div>
  </div>
  <pre id="result"></pre>
</body>
</html>