Also tried it out in both up-to-date Chrome and Safari on my up-to-date MacBook, which can play everything on https://webglsamples.org/ https://webglsamples.org

Also tried it out in both up-to-date Chrome and Safari on my up-to-date MacBook, which can play everything on https://webglsamples.org/ https://webglsamples.org/ just fine, but on this page, nothing happens.