This example demonstrates how to load and display CSV data in a React application using D3. The app fetches data from a remote GitHub gist via `d3.csv`, then stores it in component state with React hooks (`useState` and `useEffect`). Once loaded, a custom `message` function summarizes the dataset by calculating its file size in kilobytes using `d3.csvFormat`, reporting the number of rows, and listing the column count. While the data downloads, the interface displays a simple “Loading” text placeholder.