That does exist in the form of WebAuthn: https://developer.mozilla.org/en-US/docs/Web/API/Web_Authentication_API https://developer.mozilla.org/en-US/docs/Web/AP

That does exist in the form of WebAuthn: https://developer.mozilla.org/en-US/docs/Web/API/Web_Authentication_API https://developer.mozilla.org/en-US/docs/Web/API/Web_Authent... There's also the Web OTP API: https://web.dev/web-otp/ https://web.dev/web-otp/ There's been quite a lot of investment in this space by browsers and also by the standards groups like the FIDO Alliance.