From https://eliemichel.github.io/LearnWebGPU/_images/rhi.png, it looks like on FOSS systems that Vulkan is the supported graphics library for interfacing with the GPU. This is in contrast with WebGL, which specifically targets OpenGL ES, without support for Vulkan or the various proprietary graphics libraries. Am I right in this evaluation?
BTW. For the last 15 years, all web browsers on Windows do WebGL on top of DirectX (using the Angle library https://github.com/google/angle).