This example demonstrates loading external data with React and D3, displaying a summary of the loaded CSV file as text. It uses the `useState` and `useEffect` hooks to manage asynchronous data loading, with `d3.csv` fetching a dataset of CSS named colors from a GitHub gist. While the data loads, the interface shows a "Loading..." message; once fetched, a custom message function reports the file size in kilobytes, the number of rows, and the column count. React renders the result inside a `<pre>` element, combining D3's data parsing with React's state management.