One of the things that is annoying me more and more is that Apple and third-party implement differently.
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I don't know any of the details, but the corner of a Firefox window in front/on top of a Safari window demonstrates.
Firefox's rounded corner is bearable. But Safari's is like the sort of rounding you get in things intended for use in a kindergarten.
And this very site's quote box, for example, has a relatively tiny rounding. Not much more than just avoiding a perfect square corner.
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