The folks from CSS Stats have created get-css, a package to get all the CSS from a given webpage. One downside, however, is that it only works for server side rendered applications.
This package uses an actual browser under the hood to get all the CSS and exposes an HTTP endpoint that accepts a url to get the CSS from. Read all about it in this blog post on ProjectWallace.com.
- This repo is pretty much an exact copy of this example from Zeit.
- The idea to get all the CSS from a webpage comes from CSS Stats