This feature adds support for CTAP2 devices, which provide advanced security capabilities such as biometric authentication and resident keys (keys stored on the device). The WebAuthentication API (https://www.chromestatus.com/feature/5669923372138496) formerly only supported Universal 2nd Factor (U2F, also known as CTAP1 ) devices at the transport layer. This change doesn't alter the API surface itself but enables richer device interactions via the existing Web Authentication API.