You have now gained experience with the techniques for building HTML5 screens with input fields that know how to validate data, further controlling data through Dart, and storing them in the browser's local storage for offline use. Along the way, we perfected our skills to work with JSON, and how to (de)construct Dart objects to/from JSON. All these can be used in the frontend of your business application. If you need a more complex user interface, web components are the way to go, and we explore them in detail in Chapter 8, Developing Business Applications with Polymer Web Components. In the next chapter, we will sharpen our modeling and game-building skills, adding multimedia functionality to our applications.