<!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] -->
<html>
<head>
<style>
    #scroller {
        overflow: auto;
        width: 400px;
        border: 1px solid black;
        position: relative;
        visibility: hidden;
    }

    .contents {
        width: 300%;
        height: 100px;
    }
</style>
<script>
    if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.waitUntilDone();
    }

    window.addEventListener('load', () => {
        setTimeout(() => {
            document.getElementById('scroller').style.visibility = 'visible';
            if (window.internals)
                document.getElementById('layers').innerText = window.internals.layerTreeAsText(document);

            if (window.testRunner)
                testRunner.notifyDone();
        }, 0);
    }, false);
</script>
</head>
<body>
<div id="scroller">
    <div class="contents"></div>
</div>
<pre id="layers"></pre>
</body>
</html>