Tested macOS 15.5 with a M1 Macbook with Chrome and it renders correctly. The video shows the browser being used as Firefox. Firefox is still behind on their WebGPU implementation and it currently is only supported by Firefox Nightly after enabling the experimental WebGPU flag. The same will be true of Safari, which can be tested with Safari Technology Preview after enabling the WebGPU flag. It is recommended to use Chrome or a Chromium based browser for now, until Firefox and Safari have officially shipped WebGPU support.