[fuzionmonkey]

Plain pseudo classes are supported (e.g. :hover), but since descendant/child combinators aren't supported, a parent :hover can't change a child style. But any element can still have :hover styles.

[err4nt]

That seems like it would be a big roadblock to doing much useful with it. Is it impossible, not yet supported, or supported but not easy to do?

[rtsao]

Someone submitted a proposal on how to support descendent/child combinators. It's certainly possible, but I wrote a response on why it would would potentially involve tradeoffs: https://github.com/rtsao/styletron/issues/27#issuecomment-26...