<!DOCTYPE html>

<html>
<head>
    <style>
        #wrapper {
            width: 0px;
            height: 0px;
            border: 10px solid gray;
        }
        iframe {
            height: 100%;
            width: 100%;
            background-color: red;
            border: none;
        }

        #wrapper.resized {
            height: 300px;
            width: 400px;
        }
    </style>
    <script>
        if (window.testRunner) {
            testRunner.dumpAsText();
            testRunner.waitUntilDone();
        }

        window.addEventListener('load', () => {
            setTimeout(() => {
                document.getElementById('wrapper').classList.add('resized');
                if (window.testRunner) {
                     document.getElementById('layers').innerText = window.internals.layerTreeAsText(document);
                     testRunner.notifyDone();
                }
            }, 0);
        }, false);
    </script>
</head>
<body>

<div id="wrapper">
    <iframe class="composited" src="resources/composited-subframe.html"></iframe>    
</div>
<pre id="layers"></pre>
</body>
</html>