Floor Typography was inspired by the classic book about typography by Robert Bringhurst, The Elements of Typographic Style. Particularly what he writes about vertical rythm.
The library tries to be flexible enough so it can be used as a base for most web sites. That involves being uncomplicated, unopiniated and giving options.
Development is a one man show at the moment. And I’m sure the documentation is lacking, but it’s a long term hobby project. It will slowly see more updates.