I guess this rabbit hole continues if one asks what the point of such testing could be. One thing I'd find useful is that I could take screenshots (or live demo

I guess this rabbit hole continues if one asks what the point of such testing could be. One thing I'd find useful is that I could take screenshots (or live demo this site) if I was doing some non-web-development thing such as doing a presentation and wanted to explain WebAuthn flow or something. Because if I was a developer doing development, I'd test browsers with what I developed.