Ah, OK. Vertex Texturing is an extension. It's not part of the WebGL spec and only certain hardware supports it. Unfortunately, it make really cool effects a

Ah, OK. Vertex Texturing is an extension. It's not part of the WebGL spec and only certain hardware supports it. Unfortunately, it make really cool effects a lot easier. So, demos keep using it. I wish they'd stop. It's giving WebGL a worse rep for compatibility than it deserves.