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No, it isn't the developer's concern. You use cascading styles for a reason: so they can cascade. If I had to explicitly set the color, background color, font size, font weight, etc. everywhere, this would defeat the purpose of using CSS. It would bloat up stylesheets into giant download-speed-killing blobs.

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Your website CSS is inheriting the system default CSS in a sense. If you're going to override one color, you should also override the other--or override neither.

There is a special relationship between foreground and background color that doesn't exist between any of the other things you mentioned. If one layer sets a foreground color, and another layer sets the background color to the same thing, the result is invisible text. That can happen with independently sane values for each. That cannot happen with any combinations of the other properties you mentioned.

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