Joannesalfa Someone more technically inclined would need to translate it, but you can find the Canvas Level 2 specs on the WC3 website as well.
Also, the caniuse website maintains a detailed browser compatibility matrix with HTML5. The overall compatibility scores for the major browsers are:
73% iOS Safari
10% Opera Mini
Chrome is easily the strongest, Opera/Safari/Firefox/IE/iOS Safari are are roughly comparable, Blackberry and Android are a bit behind, and Opera Mini barely charts.