<!DOCTYPE html>
<html>
<head>
    <style>
        body {
            height: 2000px;
        }
        .fixed {
            position: fixed;
            width: 100%;
            height: 100px;
            background-color: green;
        }
        
        .top {
            top: 0;
        }
        .bottom {
            bottom: 0;
        }
    </style>
    <script>
        function startTest()
        {
            document.scrollingElement.scrollTop = 2000;
        }
        
        window.addEventListener('load', startTest, false);
    </script>
</head>
<body>
    <div class="fixed top"></div>
    <div class="fixed bottom"></div>
</body>
</html>