Add Emscripten window data to window properties

src/video/emscripten/SDL_emscriptenvideo.c

@@ -525,6 +525,10 @@ static bool Emscripten_CreateWindow(SDL_VideoDevice *_this, SDL_Window *window,
         };
     }, window);
 
+    // Ensure canvas_id and keyboard_element are added to the window's properties
+    SDL_SetStringProperty(window->props, SDL_PROP_WINDOW_EMSCRIPTEN_CANVAS_ID, wdata->canvas_id);
+    SDL_SetStringProperty(window->props, SDL_PROP_WINDOW_EMSCRIPTEN_KEYBOARD_ELEMENT, wdata->keyboard_element);
+
     // Window has been successfully created
     return true;
 }