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Anyone serious about 3D gaming on the Web has to do streaming.
This isn't new at all, just one of the first things I found by googling "webgl demo."
WebGPU of course goes even further.
I think the real gap is just that people by-and-large aren't building real games on top of Safari. It's more lucrative to use the app store with its low-friction payment system.
That ran well back in 2012 on shit hardware.
Kudos on the work though.