The page scrollbar in web browsers serves a useful function: The vertical position of the scrollbar thumb tells the user where they are in the page (their scroll position), while the size (height) of the scrollbar thumb tells them roughly how long the page is.
On Apple's platforms, most notably on iOS, the page scrollbar is placed inside the viewport and laid on top of web content. In some cases, this can result in a poor contrast between the scrollbar thumb and the page background beneath it. One website that has this problem is WebKit Blog. The page scrollbar on that website in iOS browsers is almost completely invisible.
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