WebGL and OpenGL Differences

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WebGL is based on the OpenGL ES 2.0 specification, and retains the semantics of OpenGL ES in order to maximize portability to mobile devices. There are some significant differences in behavior of similar APIs between OpenGL ES 2.0 and the OpenGL API on desktop systems. Many OpenGL programmers are familiar with the semantics on the desktop, and may not know about these differences in behavior. We highlight them here for clarity.