<!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] -->
<html dir="rtl">
<head>
    <style>
        .scroller {
            position: relative;
            z-index: 0;
            width: 200px;
            height: 200px;
            background-color: #eee;
            border: 5px solid gray;
            overflow-y: scroll;
        }
        
        .contents {
            width: 100%;
            height: 200%;
        }
        
        .box {
            position: absolute;
            width: 100px;
            height: 100px;
            background-color: green;
            top: 80px;
            left: 0;
        }
        
        .composited {
            transform: translateZ(0);
        }
        
        ::-webkit-scrollbar {
            width: 23px;
        }

        ::-webkit-scrollbar-track {
            background: silver;
        }

        ::-webkit-scrollbar-thumb {
            background-color: gray;
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();

        window.addEventListener('load', () => {
            if (window.internals)
                document.getElementById('layers').innerText = window.internals.layerTreeAsText(document);
        }, false);
    </script>
</head>
<body>
    <div class="scroller">
        <div class="contents">
            <div class="composited box"></div>
        </div>
    </div>
<pre id="layers"></pre>
</body>
</html>