Can I use this technology in that version of this browser?

In many web projects, the question "Can I use this in the targeted browsers?" is posed too late, resulting in ill fit customer expectations and a lot of tricks to make things work. Solution to his is simple; think before you promise. To help you with that there are many list available on the internet which give you a list of supported technologies for browsers. The site below is (IMHO) particularly handy:

http://caniuse.com: gives you al lot of technologies and techniques with the supporting browser(versions).