You are using a browser that does not support the latest WebGPU spec.
While Safari and Firefox support WebGPU, they are currently not keeping up with the latest changes in the specification.
Read more about the required steps to run WebGPU here.
Your Chrome appears to be outdated or you haven't enabled chrome://flags/#enable-unsafe-webgpu flag.
Read more about the required steps to enable WebGPU in your Google Chrome here.
In the meantime, please enjoy this recorded video of the demo running realtime on a Mac Studio M1 Max.
You can get the source and read more about this project on Github
Please choose graphics quality for the demo: