web.credential interfaces.

The Credential interface of the the Credential Management API
information about an entity as a prerequisite to a trust decision.

The CredentialsContainer interface of the the Credential Management
exposes methods to request credentials and notify the user agent
events such as successful sign in or sign out happen. This interface
accessible from `Navigator.credentials`.

The FederatedCredential interface of the the Credential Management
provides information about credentials from a federated identity
A federated identity provider is an entity that a website trusts
correctly authenticate a user, and that provides an API for that
OpenID Connect is an example of a federated identity provider

The interface of the Credential Management API provides information
a username/password pair. In supporting browsers an instance
this class may be passed in the credential member of the init
for global `fetch`.