Determine if the browser supports conditional UI, so that WebAuthn credentials can be shown to the user in the browser's typical password autofill popup.
Determine whether the browser can communicate with a built-in authenticator, like Touch ID, Android fingerprint scanner, or Windows Hello.
This method will not be able to tell you the name of the platform authenticator.
Begin authenticator "login" via WebAuthn assertion
Output from @simplewebauthn/server's generateAssertionOptions(...)
Initialize conditional UI to enable logging in via browser autofill prompts
Begin authenticator "registration" via WebAuthn attestation
Output from @simplewebauthn/server's generateRegistrationOptions(...)
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Determine if the browser is capable of Webauthn