3D scenes (closest thing to the DOM) and materials (closest thing to CSS) are several abstraction layers above what modern 3D APIs provide, this is more 'render

3D scenes (closest thing to the DOM) and materials (closest thing to CSS) are several abstraction layers above what modern 3D APIs provide, this is more 'rendering/game engine' territory. 3D APIs are more on the level of 'draw this list of triangles, and the color of a specific pixel in the triangle is computed like this: (hundreds of lines of pixel shader code)" - but even this is slowly being being replaced by even lower level code which implements completely custom rendering pipelines entirely on the GPU.