<style>
  .composited {
    transform: translateZ(0);
  }
  
  img {
    background-color: black;
    width: 50px;
    height: 50px;
  }
</style>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();

    function dumpLayers()
    {
        if (window.testRunner) {
            document.getElementById('layers').innerText = window.internals.layerTreeAsText(document);
        }
    }
    window.addEventListener('load', dumpLayers, false);
</script>
<body>
    <div style="position: absolute; left: 0px; top: 0px; z-index: 106; " class="composited">
        <img class="composited" style="position: absolute; left: 10px; top: 10px; z-index: -2;">
        <img style="position: absolute; left: 44940px; top: 15013px; z-index: 0; visibility: hidden;">
    </div>
<pre id="layers">Layer tree goes here in DRT</pre>
</body>