Running the `dev` script starts a program called [Vite](https://vitejs.dev/). Vite's job is to take your application's source files, pass them to other programs (including Svelte, in our case) and convert them into the code that will actually run when you open the application in a browser.
Running the `dev` script starts a program called [Vite](https://vitejs.dev/). Vite's job is to take your application's source files, pass them to other programs (including Svelte, in our case) and convert them into the code that will actually run when you open the application in a browser.
Speaking of which, open a browser and navigate to http://localhost:3000. This is your application running on a local *web server* (hence 'localhost') on port 3000.
Speaking of which, open a browser and navigate to http://localhost:5173. This is your application running on a local *web server* (hence 'localhost') on port 5173.
Try changing `src/App.svelte` and saving it. The application will update with your changes.
Try changing `src/App.svelte` and saving it. The application will update with your changes.