This example demonstrates loading CSS named colors data from a GitHub Gist using D3’s `csv` utility, with React managing the asynchronous state via `useState` and `useEffect`. While fetching, the app displays a “Loading…” message; once the data arrives, it renders a summary showing the file size in kilobytes (computed with `d3.csvFormat`), row count, and column count. The visualization is purely textual, using React’s `message` helper and a styled `<pre>` element, with no graphical charts or custom rendering involved.