Dude needs to google SASS or Stylus if he's considering this a problem. So many other CSS features are only supported by a limited subset of browsers. You have

Dude needs to google SASS or Stylus if he's considering this a problem. So many other CSS features are only supported by a limited subset of browsers. You have to start treating them like "extras" for the most up-to-date users and gracefully degrade for those who aren't. The problem is solved with creating great designs and mark-up from the beginning with browser limitations in mind, not addressing limitations during development with some hack.