LayoutTests/compositing/bounds-in-flipped-writing-mode.html

<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="margin-block-start: 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>