I would like some more information about what it can be used for. Would be a shame if you create a good library, but people browse around it because we simply don't understand what it can do.

My concern is that what you show being done with it isn't anything I'd be having JavaScript even handle anymore, apart from perhaps doing class swaps to trigger behaviors -- and we really don't even need that anymore.

CSS3 can do all that without JS' help.