I'm aware of that but it effectively doesn't exist for the public if it's gated behind a developer option. This goes double for Safari on iOS.
That said, I was happy to have it run well on my system with WebGL enabled since that should make it a smooth transition when Safari 8 is released.
Safari has WebGL since 5-ish but disabled by default.
To enable, Safari > Preferences > Advanced > Show Develop menu, then Develop > Enable WebGL
The presentation seems to work allright, although it suffers from some slowdowns.