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Re:Parcel CSS: A new CSS parser, compiler, and minifier by selcuka on Wednesday January 12, 2022 @07:07PM (#29914807)
> Isn't there a process of reducing it to only what one needs?

Yes there is:

https://github.com/uncss/uncss

https://github.com/purifycss/purifycss

Re:Parcel CSS: A new CSS parser, compiler, and minifier by leeoniya on Wednesday January 12, 2022 @10:36PM (#29916528)
and https://github.com/leeoniya/dropcss, if you're feeling adventurous ;)