All-in-one processor for transforming new CSS specs into more compatible CSS so that you don't need to wait for browser support.
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Pro Built on PostCSS
cssnext is a PostCSS plugin, which makes it pretty easy to use for people who are already using PostCSS.
Pro No need to learn a new syntax
Since css-next only adds new CSS features in a way that all browsers can support it, it's still CSS. So there's no need to learn any new syntax.
Because the parser/compiler can function in a web browser, it can be used with systems that cannot run similar technology on the server. For example, you could build a WordPress plugin with a front-end application that transforms CSS.
Con Lack of support in IDEs
Currently there is very little support for syntax highlighting when writing PostCSS plugins.