# Deep into the framework

- [Attestation and Metadata Statement](/v2.x-1/deep-into-the-framework/attestation-and-metadata-statement.md)
- [Authenticator Selection Criteria](/v2.x-1/deep-into-the-framework/authenticator-selection-criteria.md)
- [Authentication without username](/v2.x-1/deep-into-the-framework/authentication-without-username.md)
- [Extensions](/v2.x-1/deep-into-the-framework/extensions.md)
- [Token Binding](/v2.x-1/deep-into-the-framework/token-binding.md)