fixed-position-transformed-subframe.html

<!DOCTYPE html>
<html>
<head>
  <style type='text/css'>
    body {
        height: 1000px;
    }

    .green {
        background-color: green;
    }

    .fixed {
        position: fixed;
        top: 0px;
        left: 0px;
    }

    .box {
        width: 300px;
        height: 300px;
    }

    .container {
        position: relative;
    }

    .perspective {
        -webkit-perspective: 1px;
    }
  </style>
  <script>
    function doTest()
    {
      // Any scroll should keep the fixed-position element where it is.
      // If it stutters or disappears incorrectly, then the red background will be revealed.
      window.scrollTo(0, 150);
    }

    window.addEventListener('load', doTest, false);
  </script>
</head>
<body>
  <div class="green fixed box">
    <div class="container">
      <div class="perspective"></div>
    </div>
  </div>
</body>
</html>

chromium/third_party/blink/web_tests/compositing/iframes/resources/fixed-position-transformed-subframe.html