<!DOCTYPE html> <!-- webkit-test-runner [ internal:AsyncOverflowScrollingEnabled=true ] -->
<html>
<head>
    <style>
        .flex {
            display: flex;
            width: 500px;
            border: 1px solid black;
        }
        .clipped {
            overflow: hidden;
            width: 100%;
        }
        .relative {
            position: relative;
        }
        .scroller {
            overflow-y: scroll;
            width: 100%;
            height: 500px;
            background-color: red;
        }
        .contents {
            height: 3000px;
            width: 100%;
            background-color: green;
        }
    </style>
    <script src="../../../../resources/ui-helper.js"></script>
    <script>
        if (window.testRunner)
            testRunner.waitUntilDone();
        
        window.addEventListener('load', async () => {
            let scroller = document.querySelector('.scroller');
            
            await UIHelper.delayFor(0);
            scroller.scrollTop = 3000;
            await UIHelper.delayFor(0);
            
            await UIHelper.mouseWheelScrollAt(200, 200, 0, 1, 0, 100);
            
            if (window.testRunner)
                testRunner.notifyDone();
        }, false);
    </script>
</head>
<body>
    <div class="flex">
        <div class="clipped">
            <div class="relative">
                <div class="scroller">
                    <div class="contents">&nbsp;</div>
                </div>
            </div>
        </div>
    </div>
</body>
</html>