compositing/layer-creation/fixed-position-scroll.html

<!DOCTYPE html>
<html>
  <head>
    <style type="text/css">
      .absolute {
        background-color: green;
        height: 96px;
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        z-index: 2;
      }

      .fixed {
        background-color: red;
        height: 32px;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        z-index: 1;
      }

      .transformed {
        background-color: #6d6d6d;
        padding-top: 24px;
        margin: 64px 0px 1920px 0px;
        width: 100%;
        height: 40px;
        -webkit-transform: translateZ(0);
      }
    </style>
    <script src="../../fast/repaint/resources/repaint.js"></script>
    <script type="text/javascript" charset="utf-8">
      if (window.testRunner) {
        testRunner.dumpAsText(true);
        testRunner.waitUntilDone();
      }

      function repaintTest()
      {
        window.scrollBy(0,-96);
        if (window.testRunner)
          testRunner.notifyDone();
      }

      function doTest()
      {
        window.scrollBy(0,-2048);
        window.scrollBy(0,160);
        runRepaintTest();
      }
      window.addEventListener('load', doTest, false);
    </script>
  </head>
  <body>
    <div class="absolute"></div>
    <div class="fixed"></div>
    <div class="transformed"></div>
    <p> For this test to pass, you should not see a red line when scroll position is less or equal to 64px from the top. </p>
  </body>
</html>