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Dumb question maybe but why is Bootstrap (from Twitter) not on this list? What are the inclusion criteria?

It was originally my list of interactive frontend component libraries that I now keep track of here: https://gist.github.com/manigandham/34154e63dc3c1b8747fab40d...

If you want style guides and design systems then the link by "oedmarap" is much better.

They don’t use it anymore