CSS3 and HTML5 Browser Support
Browsers are continually adding support for CSS3 and HTML5 features. Below are some charts that track current browser support.
FindMeByIP Charts
http://www.findmebyip.com/litmus/
FindMeByIP - Identifying Your Current Browser
http://fmbip.com/#target-selector
HTML5 & CSS3 Readiness Chart
When can I use... Charts Also Include Mobile Devises