<!DOCTYPE html> <!-- webkit-test-runner [ internal:AsyncOverflowScrollingEnabled=true ] -->
<html>
<head>
    <style>
        .scroller {
            overflow: scroll;
            height: 300px;
            width: 300px;
            border: 1px solid black;
        }
        .contents {
            height: 2000px;
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.dumpAsText();

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