<!DOCTYPE html>
<html>
<head>
<style>
body {
    font-family: ahem;
    -webkit-font-smoothing: none;
}
</style>
<script>
    window.addEventListener('load', event => {
        let out = document.querySelector('#out');
        let target = document.querySelector('#target');

        if (!window.internals || !window.testRunner || !window.eventSender) {
            out.innerText = 'This test requires internals';
            return;
        }

        testRunner.dumpAsText(false);
        testRunner.waitUntilDone();

        document.addEventListener('webkitfullscreenchange', event => {
            if (document.webkitIsFullScreen) {
                setTimeout(() => {
                    out.innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_CONTENT_LAYERS);
                    document.webkitCancelFullScreen();
                }, 0)
            } else 
                testRunner.notifyDone();
        });


        document.addEventListener('keydown', event => {
            target.webkitRequestFullScreen();
        });
        if (window.eventSender)
            eventSender.keyDown('a');
    });
</script>
</head>
<body>
    <div id=target></div>
    <pre id=out></pre>
</body>
</html>