This example demonstrates a simple React application that counts button clicks, displaying the current total in a paragraph. It shows how D3.js and React can be combined in a single HTML page, with the D3 library loaded via a CDN link. The code uses React’s `useState` hook to manage the count value, and the `ReactDOM.render` method to mount the app into the DOM. The interface increments the displayed number each time the user clicks the button, illustrating basic state management in a web visualization context.