This example demonstrates how to load external data into a React application using D3 utilities. The visualization displays a text summary of CSS named colors data fetched from a GitHub gist, showing the file size in kilobytes, row count, and column count. The code uses React hooks like `useState` and `useEffect` to manage asynchronous data loading, while `d3.csv` parses the CSV file and `d3.csvFormat` measures its size. A fallback "Loading..." message appears until the data arrives.