vertexAttribPointer(uint index, int size, enum type,bool normalized, long stride, long offset)

Hello.

I'm trying figuring out what goes wrong when I try to call this method with a stride or offset <> 0.
Could it be that webGL doesn't allow us to use those 2 parameters?

Could anybody provide a short working code sample where stride and offset are set? (if the code is long you could put it on http://pastebin.com)