This example demonstrates how to load and summarize CSV data using React and D3. The app fetches a named colors dataset from a GitHub gist using D3’s `csv` function, then displays the file size in kilobytes, row count, and column count in a large `<pre>` tag. While data is loading, the text shows “Loading...”. The code uses React hooks like `useState` and `useEffect` to manage asynchronous data fetching and rendering.