composited-parent-iframe.html | Explore in Territory

<!DOCTYPE html>

<html>
<head>
  <style type="text/css" media="screen">
    iframe {
        border: 10px solid black;
        padding: 5px;
        height: 150px;
        width: 300px;
        -webkit-box-shadow: 0 0 20px black;
        will-change: transform;
    }
  </style>
  <script type="text/javascript" charset="utf-8">
    if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.waitUntilDone();
    }

    function doTest()
    {
        if (window.testRunner) {
            document.getElementById('layers').innerHTML = internals.layerTreeAsText(document);
            testRunner.notifyDone();
        }
    }

    window.addEventListener('load', doTest, false);
  </script>
</head>
<body>

    <!-- The parent document should be thrown into compositing mode by the iframe. -->
    <iframe src="resources/composited-subframe.html"></iframe>

    <pre id="layers">Layer tree appears here in DRT.</pre>
</body>
</html>

chromium/third_party/blink/web_tests/compositing/iframes/composited-parent-iframe.html