<!DOCTYPE html>

<html lang="en">
<head>
  <style type="text/css" media="screen">
    body {
      height: 2600px;
    }
    
    .container {
      width: 200px;
      height: 200px;
      margin: 10px;
      overflow: auto;
      border: 10px solid black;
    }
    
    .inner {
      width: 100px;
      height: 2200px;
      padding: 5px;
      font-size: 18pt;
      background-color: green;
    }
    
    .compositing {
      position: absolute;
      top: 21px;
      left: 21px;
      width: 100px;
      height: 100px;
      -webkit-transform: translateZ(0);
    }

    p {
      font: 1em/1 Ahem, sans-serif;
    }
    
    p.middle {
      position: absolute;
      top: 10%;
    }

    p.bottom {
      position: absolute;
      bottom: 0;
    }
  </style>
  <script type="text/javascript" charset="utf-8">
    if (window.testRunner) {
      testRunner.dumpAsText();
      testRunner.waitUntilDone();
    }

    function doTest()
    {
      var scrollables = document.querySelectorAll('.container');
      for (var i = 0; i < scrollables.length; ++i)
        scrollables[i].scrollTop = 100;

      if (window.testRunner) {
        document.getElementById('layers').innerText = window.internals.layerTreeAsText(document);
        testRunner.notifyDone();
      }
    }

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

<body>
  
  <!-- Go into compositing. -->
  <div class="compositing"></div>

  <!-- "middle" text should be visible -->
  <div class="container" style="position: relative; overflow: hidden;">
    <div class="inner" style="position: relative;">
      <p class="top">top</p>
      <p class="middle">middle</p>
      <p class="bottom">bottom</p>
    </div>
  </div>

  <!-- Vertical scrollbar should be visible -->
  <!-- "middle" text should be visible -->
  <!-- "inner" should use a tiled layer -->
  <div class="container" style="position: relative;">
    <div class="inner" style="position: relative;">
      <p class="top">top</p>
      <p class="middle">middle</p>
      <p class="bottom">bottom</p>
    </div>
  </div>

  <pre id="layers">Layer tree goes here in DRT</pre>

</body>
</html>