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diff --git a/dom/webidl/CredentialManagement.webidl b/dom/webidl/CredentialManagement.webidl
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+++ b/dom/webidl/CredentialManagement.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://www.w3.org/TR/credential-management-1/
+ * and
+ * https://w3c.github.io/webauthn/
+ * and
+ * https://fedidcg.github.io/FedCM/
+ */
+
+[Exposed=Window, SecureContext]
+interface Credential {
+  readonly attribute USVString id;
+  readonly attribute DOMString type;
+};
+
+[Exposed=Window, SecureContext]
+interface CredentialsContainer {
+  [NewObject]
+  Promise<Credential?> get(optional CredentialRequestOptions options = {});
+  [NewObject]
+  Promise<Credential?> create(optional CredentialCreationOptions options = {});
+  [NewObject]
+  Promise<Credential> store(Credential credential);
+  [NewObject]
+  Promise<undefined> preventSilentAccess();
+};
+
+dictionary CredentialRequestOptions {
+  // This is taken from the partial definition in
+  // https://w3c.github.io/webauthn/#sctn-credentialrequestoptions-extension
+  [Pref="security.webauth.webauthn"]
+  PublicKeyCredentialRequestOptions publicKey;
+  // This is taken from the partial definition in
+  // https://fedidcg.github.io/FedCM/#browser-api-credential-request-options
+  [Pref="dom.security.credentialmanagement.identity.enabled"]
+  IdentityCredentialRequestOptions identity;
+  AbortSignal signal;
+};
+
+dictionary CredentialCreationOptions {
+  // This is taken from the partial definition in
+  // https://w3c.github.io/webauthn/#sctn-credentialcreationoptions-extension
+  [Pref="security.webauth.webauthn"]
+  PublicKeyCredentialCreationOptions publicKey;
+  AbortSignal signal;
+};