JSX

Observable Framework documentation: JSX Source: https://observablehq.com/framework/jsx

React is a popular and powerful library for building interactive interfaces. React is typically written in JSX, an extension of JavaScript that allows HTML-like markup. To use JSX and React, declare a JSX fenced code block (```jsx). You can alternatively use a TSX fenced code block (```tsx) if using JSX with TypeScript.

For example, to define a Greeting component that accepts a subject prop:

```jsx
function Greeting({subject}) {
  return <div>Hello, <b>{subject}</b>!</div>
}
```