As our critics continue to write reviews and moderate comments, we will take some time to look into options for improving the user interface and adding new functions. Modern websites use JavaScript-driven effects to aid navigation, reduce on-screen clutter, and provide interactive features that are not possible with static HTML. Joomla! has several built-in elements that you can use without writing a single line of JavaScript. The MooTools framework powers many elements seen throughout the Joomla! backend UI; these can be reused in both the frontend and the backend. We will learn to use JavaScript effects through these topics: