chromium/third_party/blink/web_tests/transforms/2d/transform-fixed-container.html

<!DOCTYPE html>

<html>
<head>
  <style type="text/css" media="screen">
    body {
      margin: 0;
      height: 1000px;
    }
    
    .box {
      width: 100px;
      height: 100px;
      outline: 1px solid black;
    }

    .fixed {
      position: fixed;
    }

    .transformed {
      transform: rotate(0);
    }
    
    .indicator {
      position: absolute;
      background-color: red;
    }
    
  </style>
  <script type="text/javascript" charset="utf-8">
    // Scroll on load to test fixed positioning.
    window.addEventListener('load', function() {
      window.scrollTo(0, 100);
    }, false)
  </script>
</head>
<body>

  <div class="indicator box" style="left: 50px; top: 200px;"></div>
  <div class="indicator box" style="left: 250px; top: 200px;"></div>

  <div class="transformed box" style="margin: 150px 50px;">
    <div class="fixed box" style="background-color: green; margin-top: 50px;">
    </div>
  </div>

  <div class="transformed fixed box" style="left: 250px; top: 50px;">
    <div class="transformed box" style="margin-top: 50px; background-color: green;">
    </div>
  </div>

  <p>Tests fixed position elements combined with transforms. You should see no red above.</p>

</body>
</html>