<body style="margin: 0; padding: 100px;">
<div style="width: 100px; height: 100px; background-color: red;"></div>
<div style="width: 100px; height: 100px; -webkit-writing-mode: horizontal-bt; -webkit-transform: translatez(0)">
<div style="-webkit-margin-before: 100px; height: 100px; background-color: green;"></div>
</div>
<pre id="console"></pre>
<script>
if (window.testRunner) {
testRunner.dumpAsText();
document.getElementById("console").appendChild(document.createTextNode(window.internals.layerTreeAsText(document)));
}
</script>
</body>
