I'm pretty sure Safari supports it since iOS 18! See for example https://www.corbado.com/blog/ios-18-passkeys-automatic-passkey-upgrades https://www.corbado.com

I'm pretty sure Safari supports it since iOS 18! See for example https://www.corbado.com/blog/ios-18-passkeys-automatic-passkey-upgrades https://www.corbado.com/blog/ios-18-passkeys-automatic-passk... and https://www.corbado.com/blog/passkeys-prf-webauthn https://www.corbado.com/blog/passkeys-prf-webauthn.