> I don't do some half-assed horizontal "progress bar" as you scroll down the
page. Your browser probably /already/ has one of those if it's graphical. It's
called the scroll bar. (See also: no animations.)
Sadly, I would argue that this is inaccurate. Especially on mobile browsers, the prevalence of visible scroll bars seems to have dropped off a cliff. I'll happily excuse the progress bar, especially because this one can be done without JavaScript.
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