diff --git a/src/app.ts b/src/app.ts
index 31885302..5b3dd715 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -979,8 +979,7 @@ export class App extends Protocol<AppRequest, AppNotification, AppResult> {
       });
     };
 
-    sendBodySizeChanged();
-
+    // ResizeObserver will fire for initial layout and all subsequent changes
     const resizeObserver = new ResizeObserver(sendBodySizeChanged);
     // Observe both html and body to catch all size changes
     resizeObserver.observe(document.documentElement);