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I never know this until just now: the Selectors spec is right: there is no such thing as a "multiple selector". That's just a term made up by jQuery as if it were a selector itself, but it's not, it's just a notation used to separate multiple selectors. It's not a "selector" itself, let alone one called a "multiple selector", or a combinator despite what jQuery and MDN claim.
I've been using it like that for decades, and I guess my code just accidentally worked for other reasons!