The React project originated at Facebook; the open source project has a BSD license and a patent rights grant from Facebook. React is not an end-to-end JavaScript application framework.

Now, here’s where the special nature of React comes in. Besides normal HTML, CSS, and JavaScript, the bulk of your React code will be written in JSX.

In this practical React tutorial, you'll learn how to build an animated multi-level dropdown menu from scratch. Inspired by modern interfaces like Facebook, this project covers the essentials of ...