[pattyj]

https://github.com/Level-2/Transphporm is the same idea with more selectors and caching

[abathur]

Interesting to see this and the gp--especially how others are thinking/communicating about them. I have been picking at something that uses css in a similar way, but I've found it difficult to put what it is into words.

[wwweston]

Nice! Also seems to be written in more recent php versions/idioms.