The Khronos Group publishes interoperability specifications for graphics and related computational interfaces. Its OpenGL specification defines a rendering pipeline, including rasterization, fragment shaders and per-fragment operations. A specification makes observable behavior portable across implementations: for example, a configured depth buffer comparison determines whether a candidate surface contributes to the framebuffer. This is a definition of an interface contract, rather than a requirement that all implementations use identical internal hardware.[ref]
https://www.khronos.org/about/. Organizational description and open interoperability standards
[ref]The OpenGL Graphics System Version 4.6 Core Profile by Khronos Group. Chapters 14, 15 and 17
