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This is great. I never knew about the universal selector (*) or the general sibling selector (~). I'm sure I'll learn a few more tricks from this as well, not finished yet.

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Google[0] and Mozilla[1] both have some information on their developer sites about why avoiding the universal selector is preferable from a performance point of view.

I'm yet to find a case that has absolutely required the use of the universal selector. Has anybody else?

[0] https://developers.google.com/speed/docs/best-practices/rend...

[1] https://developer.mozilla.org/en-US/docs/Web/CSS/Universal_s...

I mostly see the universal selector used for resets (like removing all padding and margins), but it's definitely not frequently used.

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