--- original
+++ modified
@@ -0,0 +1,21 @@
+/* SPDX Id: AGPL-3.0-or-later */
+
+[Exposed=Window]
+interface PeerStreamEvent : Event {
+    [Throws] constructor(DOMString type, PeerStreamEventInit eventInitDict);
+    readonly attribute MessagePort port;
+    readonly attribute DOMString peerId;
+};
+
+dictionary PeerStreamEventInit : EventInit {
+    required MessagePort port;
+    required DOMString peerId;
+};
+
+partial interface Navigator {
+    [Throws] Promise<MessagePort> createPeerStream(DOMString peerId, USVString targetURL);
+};
+
+partial interface Window {
+    attribute EventHandler onpeerstream;
+};