<!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] -->
<html>
<style>
    .scroller {
        margin: 10px;
        width: 200px;
        height: 200px;
        border: 2px solid gray;
        overflow: scroll;
    }
    .contents {
        height: 200%;
    }
    .handler {
        background-color: silver;
        margin: 20px;
        width: 100px;
        height: 400px;
    }
    </style>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
    
    window.addEventListener('load', () => {
        if (window.internals)
            results.innerText = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_EVENT_REGION);
    }, false);
</script>
<body>
    <div class="scroller">
        <div class="contents">
            <div class="handler" onmousewheel="(void)0">
            </div>
        </div>
    </div>
<pre id="results"></pre>
</body>
</html>