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Exciting times! Already been using nested selectors plenty at work. I got used to them quite a lot! Only caveat with them is that linters get very confused as to where we define them first. With good reason. It gets a little chaotic on bigger projects. Maybe skill issue. Very useful nonetheless.

Largely eliminated by modern CSS: Variables (--custom-property), nesting, calc(), min()/max()/clamp() Used to be top reasons for SCSS but are now native.