[aborsy]

Can’t you use both a passkey and regular password?

Otherwise if I login by passkey to a website on an Apple device, how do I login outside Apple’s walled garden?

[leokennis]

No. That would be like having a steel door in your house, and a cardboard one next to it.

I believe the login flow on another device (let’s say a Windows laptop) is that you scan some QR code on the laptop’s screen from your iPhone. Then the iPhone communicates with the site and validates the passkey. And if that is all OK the site on the laptop will proceed to log you in.