This example demonstrates a minimal React application that fetches a CSV file from a GitHub Gist using D3’s `csv` method. The fetched data is stored in React state via the `useState` and `useEffect` hooks, and the app displays a message showing the approximate size of the formatted CSV data in kilobytes. The code uses React DOM to render the component into the page, and D3 v7 provides the CSV parsing functionality. A large `pre` element styles the output text prominently.