Game requirements

What are the game we build requirements for PC?

For natives games : a computer supporting OpenGL (1.1/2.0 I think = all computers), maybe Windows XP or + (doesn’t exactly know)
For HTML5 games : a good webbrowser supporting HTML5 (Firefox, Chrome, Opera, maybe the last version of IE).

Thank you very much!

Hi. Could someone help filling the remaining 2 fields for steam please?