We had originally planned to go all-in on passkeys for ONCE/Campfire, and we built the early authentication system entirely around that. It was not a simple setup! Handling passkeys properly is surprisingly complicated on the backend, but we got it done. Unfortunately, the user experience kinda sucked, so we ended up ripping it all out...
The site doesn’t need to implement this; the browser handles that part.
I confirmed this works and logged into Github using Google Chrome on my work computer using a passkey stored in Bitwarden earlier today. I had to enable Bluetooth for Chrome, since I’d had it disabled, but then everything else was seamless.