W3C has approved the Federated Identity Working Group Charter.
The mission of the Federated Identity Working Group is to develop specifications to allow a website to request a federated identity credential or assertion with the purpose of authenticating a user and/or requesting a set of claims in a compatible way to OIDC or SAML.
https://lists.w3.org/Archives/Public/public-fedid-wg/2024Mar/0000.html