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.

It is, however, wrapped inside of JavaScript. The HTML is a return value for the App function, which is a functional component in React. The JSX markup is the function’s return value.

React components are created through JavaScript variables that use a createClass method to render HTML that presents data supplied in the form of properties ("props") or state, depending on whether ...

The Practical Client Eliminate the Barrier Between JavaScript and HTML (or Anything Else) The JSX tool lets you describe your page as a set of custom elements that you define in TypeScript classes.