I really doubt that the mature implementations of wgpu will not allow an app to check for hardware acceleration.
There are browser flags to disable black listing, which is something that regular Joe/Jane has no idea whatsoever that they exist.
Besides, you can head off to webgpu.io and follow up on meeting minutes.
Even better, attend the upcoming WebGL/WebGPU meeting from Khronos (registration currently open) and pose that question if you prefer to hear the same from the browser vendors themselves.
Have a nice joyful day.