This example displays summary statistics about a yearly footfall dataset, presenting file size, row count, and column details as plain text. It fetches CSV data asynchronously using the `csv` function from D3 v7, stores the result in React state with `useState` and `useEffect`, and renders the output using ReactDOM. The code demonstrates a minimal React integration with D3, where a custom module (`msg.js`) formats the data metrics for display in a large `<pre>` element.