Does Safari for iOS 4.2.1 support WebGL? Does iOS 4.2.1, the latest release at the time of this question, support WebGL?
Not at this point, no. WebKit, that which Safari for Mac OS and iOS are both based on, is supposed to support WebGL but I have yet to be able to get it work properly on Mac OS 10.6, much less iOS. I get the impression the whole thing is too new (relatively) for proper support.