How do I find out when I can safely drop vendor prefixes for a CSS3 property?

Question

I was testing some CSS3 stuff and I discovered that some properties like border-radius don\'t need the vendor prefix anymore (at least on recent up to date brow

Answer 1

http://html5please.us/ Offers a similar service but they also provide advice on fallbacks for CSS3 properties where appropriate. I find both sites useful.