https://github.com/leeoniya/dropcss https://github.com/leeoniya/dropcss still in js, but very fast, ~10KB (min), 0 dependencies, and does not require npm [1]:

https://github.com/leeoniya/dropcss https://github.com/leeoniya/dropcss still in js, but very fast, ~10KB (min), 0 dependencies, and does not require npm [1]: however, it expects properly formed html and css; the parsers are quite unforgiving. (i'm the author) [1] https://github.com/leeoniya/dropcss/tree/master/dist https://github.com/leeoniya/dropcss/tree/master/dist