Column request: Uses CSS syntax

[gertsonderby]

At least some of the listed libraries use CSS syntax, rather than or as well as object literals (styled-components, styled-jsx, etc.), some only permit objects. It would be nice if this was also part of the table, since that is a significant factor for those who for example have to port existing CSS, or use third-party components that do not style themselves.

[MicheleBertoli]

I'm closing this in favor of #73