--- original
+++ modified
@@ -0,0 +1,41 @@
+/* SPDX Id: AGPL-3.0-or-later */
+
+[Exposed=Window,
+Func="Embedder::is_allowed_to_embed"]
+interface Peer : EventTarget {
+    attribute DOMString displayName;
+    readonly attribute DOMString id;
+
+    // This peer left.
+    attribute EventHandler onpeerleft;
+};
+
+[Exposed=Window,
+Func="Embedder::is_allowed_to_embed"]
+interface Pairing : EventTarget {
+    // Our own endpoint.
+    Promise<Peer> local();
+
+    // The list of paired peers.
+    Promise<sequence<Peer>> peers();
+
+    // Start a pairing handshake with a discovered peer.
+    Promise<boolean> requestPairing(Peer peer);
+
+    // A new unpaired peer was discovered.
+    attribute EventHandler onpeerdiscovered;
+
+    // A paired peer joined.
+    attribute EventHandler onpeerjoined;
+
+    // A paired peer left.
+    attribute EventHandler onpeerleft;
+
+    // An unpaired peer is requesting pairing.
+    attribute EventHandler onpairingrequest;
+};
+
+partial interface Embedder {
+    [Func="Embedder::is_allowed_to_embed"]
+    readonly attribute Pairing pairing;
+};