= Khronos Group
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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.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]{ref}
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