Hi all,
One of the two differences between Canvas 2D and WebGL is there is no immediate replacement for the XOR effect. We can add it via a shader in future, but doing full shader effects is probably some way off. The easiest way to solve the incompatibility before then is simply to remove the XOR effect.
I don't think it's a very useful effect, it looks very weird, so I wouldn't imagine many people have used it. Has anyone used it? Vote in the poll to let me know!