<!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] -->
<html>
<head>
    <style>
        #scroller {
            width: 500px;
            height: 500px;
            border: 1px solid black;
            overflow: scroll;
            margin: 10px;
            will-change: transform;
        }
        
        .filler {
            height: 160px;
            width: 10px;
        }
        
        .clipper {
            width: 300px;
            height: 400px;
            margin: 10px;
            overflow: hidden;
            border: 2px solid black;
            position: relative;
            will-change: transform;
        }
        
        .controls-bar-bottom {
            position: absolute;
            width: 100%;
            height: 50px;
            bottom: 0;
            z-index: 0;
        }
        
        .above, .below {
            position: absolute;
            width: 100%;
            height: 100%;
        }
        
        .above {
            background-color: green;
        }
        
        .below {
            background-color: red;
            will-change: transform;
        }
    </style>
    <script>
        window.addEventListener('load', () => {
            document.getElementById('scroller').scrollTop = 95;
        }, false);
    </script>
</head>
<body>
    <div id="scroller">
        <div class="filler"></div>
        <div class="clipper">
            <div class="controls-bar-bottom">
                <div class="below"></div>
                <div class="above"></div>
            </div>
        </div>
        <div class="filler"></div>
    </div>
</div>
</body>
</html>