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IIRC it was delayed multiple times. I think the first intent to ship from chrome was before 100 but they kept pushing it off. Firefox still does not support it. There are projects like wgpu[0] that provide a higher level API for WebGPU and I have used some projects using it with no issues. WFIW I didn't see any issue with OP's demo either.

[0] https://github.com/gfx-rs/wgpu

Yes it is still a bit new. WebGPU is not finished and is still being worked on: https://webgpu.io/ And it is supported by very few browser also: https://caniuse.com/webgpu

Smooth as a baby's bottom for me.