<!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>Opacity Transitions and Stacking Context</title>
  <style type="text/css" media="screen">
    .container {
      position: relative;
      height: 300px;
      width: 300px;
      margin: 10px;
      background-color: green;
      -webkit-transition-property: opacity;
      -webkit-transition-timing-function: linear;
      -webkit-transition-duration: 5s;
    }
  
    #first {
      opacity: 0.5;
    }

    .box {
      position: absolute;
      left: 10px;
      top: 10px;
      height: 200px;
      width: 200px;
      background-color: blue;
    }

    .indicator {
      position: absolute;
      top: 150px;
      left: 150px;
      height: 100px;
      width: 100px;
      background-color: orange;
      z-index: -1;
    }
  </style>
  <script type="text/javascript" charset="utf-8">
    if (window.layoutTestController)
      layoutTestController.waitUntilDone();

    function runTest()
    {
      var container = document.getElementById('first');
      container.style.opacity = 1;
      
      // dump the tree in the middle of the transition
      if (window.layoutTestController) {
        if (layoutTestController.pauseTransitionAtTimeOnElementWithId)
          window.setTimeout(function() { layoutTestController.pauseTransitionAtTimeOnElementWithId("opacity", 2.5, "first"); layoutTestController.notifyDone(); }, 0);
        else
          window.setTimeout(function() { layoutTestController.notifyDone(); }, 2500);
      }
    }
    
    window.addEventListener('load', runTest, false);
  </script>
</head>
<body>

  <div class="container" id="first">
    <div class="box"></div>
    <div class="indicator"></div>
  </div>

</body>
</html>