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There's something about CSS I just don't fundamentally get. Why write

:is(article, aside) > header { ... }

to denote a the disjunction of article or aside elements, and then the header children of that disjunction, when parentheses already seem clear enough?

(article, aside) > header { ... }

To me it's overriding the precedence of the comma operator, something parens have done for a long time.

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