This doesn't accurately reflect how some of these scrollbars work. The Amiga and Windows 3.x ones, for example, should scroll a full page page up and down when

This doesn't accurately reflect how some of these scrollbars work. The Amiga and Windows 3.x ones, for example, should scroll a full page page up and down when you click above or below the scrollbar. It doesn't jump to 10% when you click 10% from the top.