Automated approach to `can i use` testing a websites css

Were currently wrapping up a site that uses quite allot of semi-complex css rules. The majority of them we have been checking along the way using caniuse.com but im sure some stuff might have slipped through that we will either have to write fallbacks for, not use at all, or use JS for instead due to browser computability.

Is there an automated tool / way of testing a css file against can i use for any possible problems.