<!DOCTYPE html>
<html>
<head>
<style>
.layerized {
    transform: translateZ(0);
    width: 600px;
    height: 600px;
}
.vspace {
    height: 1000px;
}
</style>
<script>
if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitUntilDone();
}

window.onload = function() {
    if (window.testRunner) {
        var out = document.getElementById('out');
        out.innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_BACKING_STORE_ATTACHED);
        testRunner.notifyDone();
    }
};
</script>
</head>
<body>
<pre id="out"></pre>
<div class="layerized">I'm attached.</div>
<div class="vspace"></div>
<div class="layerized">I'm detached.</div>
</body>
</html>