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Federated Credential Management (FedCM) is a browser-mediated sign-in API that enables “Sign in with…” flows without relying on third-party cookies. It standardizes the login experience, reduces cross-site tracking signals, and helps identity providers and relying parties deliver more reliable, privacy-preserving authentication.

Encrypted Media Extensions (EME) is the web platform’s standard way to enable playback of encrypted, DRM-protected media in the browser. Rather than handling decryption directly, your application coordinates with the browser’s Content Decryption Module (CDM): it requests access to a media key system via Navigator.requestMediaKeySystemAccess(), attaches the resulting MediaKeys to a specific HTMLMediaElement with setMediaKeys(), and then manages the message exchange for licenses/keys through a MediaKeySession. When the media element encounters encrypted initialization data, it fires an encrypted event (represented by MediaEncryptedEvent), and the CDM can emit session messages (MediaKeyMessageEvent) that your app relays to whatever key infrastructure you use. EME is widely available across modern browsers and is typically restricted to secure contexts (HTTPS).