--- original
+++ modified
@@ -0,0 +1,37 @@
+/* SPDX Id: AGPL-3.0-or-later */
+
+// Servo-specific API for communication between web content and the embedder.
+
+[Exposed=Window,
+Func="Embedder::is_allowed_to_embed"]
+interface Embedder : EventTarget {
+    // Request the embedder to open a new OS-level window with the given URL.
+    undefined openNewOSWindow(USVString url, optional USVString features = "");
+
+    // Request the embedder to close the currently focused OS window.
+    undefined closeCurrentOSWindow();
+
+    // Request the embedder to exit the application.
+    undefined exit();
+
+    // Request the embedder to start a window drag operation.
+    // This allows the window to be moved by dragging from web content.
+    undefined startWindowDrag();
+
+    // Request the embedder to start a window resize operation.
+    // This allows the window to be resized from web content.
+    undefined startWindowResize();
+
+    // Event fired when Servo encounters an error.
+    // The event is a CustomEvent with detail: { errorType: string, message: string }
+    attribute EventHandler onservoerror;
+
+    // Event fired when a preference changes.
+    // The event is a CustomEvent with detail: { name: string, value: any }
+    attribute EventHandler onpreferencechanged;
+};
+
+partial interface Navigator {
+    [Func="Embedder::is_allowed_to_embed"]
+    readonly attribute Embedder embedder;
+};