4 ms·

There is theory and there is practice. What grandparent comment says is the likely outcome in practice

• mynameisvlad 3y ago
  ... Unless you care about that and use a Yubikey or other physical security key. There is absolutely nothing stopping you from doing so as long as your Yubikey supports WebAuthN (the latest do). You are prompted to use another phone or physical security key if a resident key isn't found on your device, and even if it is, you are given the option of doing so instead of using the one found. This is not a hypothetical feature or theory or something, it's part of the spec and is implemented. It's as practical as it gets.
  • hooverd 3y ago
    Unless the website decides to enforce attestation and not allow that.