Migration of nonce to params Field: The nonce parameter in navigator.credentials.get() is moving from a top-level field to the params object for better API design, extensibility, and maintainability. This structured approach simplifies parsing for Identity Providers, supports future-proofing without versioning, and aligns with modern API patterns. For Relying Parties, the impact is minimal—they provide the same nonce value in a new location. In Chrome 143 (Warning Phase): nonce accepted both at top level and inside params. Top-level usage triggers a console warning. Rename code to error in IdentityCredentialError: The code attribute in IdentityCredentialError is renamed to error for clearer semantics, better developer experience, and alignment with web standards. This change reduces ambiguity and avoids conflicts with DOMException.code. Additionally, error.code becomes error.error, retaining its DOMString type. In Chrome 143 (Warning Phase): Both error and code attributes are supported. Using code triggers a console warning, guiding developers to migrate.
see https://github.com/w3c-fedid/custom-requests/issues/3 for more discussion on motivation