<!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] -->
<html>
<head>
    <style>
        .scroller {
            border: 1px solid black;
            margin: 10px;
            padding: 10px;
            overflow: scroll;
            transform: translateZ(0px);
        }
        
        .box {
            position: absolute;
            width: 100px;
            height: 100px;
            border: 2px solid blue;
            background-color: green;
            padding: 10px;
        }
        
        body.changed .scroller {
            overflow: visible;
        }
    </style>
    <script>
        if (window.testRunner)
            testRunner.waitUntilDone();

        window.addEventListener('load', () => {
            requestAnimationFrame(() => {
                document.body.classList.add('changed');
                if (window.testRunner)
                    testRunner.notifyDone();
            });
        }, false);
    </script>
</head>
<body>
    <div class="scroller">
        You should see the entire green box below
        <div class="box"></div>
    </div>
</body>
</html>