This example loads a CSV dataset of CSS named colors and displays a plain-text summary of its contents. Using React’s `useState` and `useEffect` hooks, it fetches the data with `d3.csv`, then computes and renders the file size in kilobytes, the number of rows, and the number of columns via a custom `message` function that relies on `d3.csvFormat`. The interface shows “Loading…” until the asynchronous request resolves.