I don't know a non-JS CSS purger, but you don't need postcss to use PurgeCSS.
397 karma · joined June 22, 2011
1. https://angry-hypatia-f1529a.netlify.com/
2. https://github.com/philippbosch/tailwind-ui-purge-css-exampl...
> "The skins use the latest web standards such as XHTML and CSS 2."
Will wait for the official release announcement next time. Sorry again.