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This is a bit of a pedantic question, but perhaps worth asking. Is there, mechanically, a difference between a pseudo-class and a pseudo-selector in CSS? We use the term interchangeably around here, but it seems that there’s a reason for the two terms. Is there any use to differentiating the two?
A pseudo-class is a specified thing, while pseudo-selector is a made up word.
(Meanwhile, a pseudo-class matches an element when certain conditions are met (e.g. the mouse is pointing at it, or it is the first child of its parent), while a pseudo-element is something that can be matched but isn’t a real or whole element, such as “Thing before an element” or “First line of text in an element”.)