This example shows the loading state of a React app as it fetches a CSV file of CSS named colors from a GitHub gist. The interface displays a formatted text summary with the file size in kilobytes, row count, and column count once the data arrives, preceded by a “Loading…” message. The code uses React hooks `useState`, `useEffect`, and `useCallback` to manage the asynchronous `d3.csv` fetch, while a separate `Message` component computes the statistics using `d3.csvFormat`. Data is rendered as HTML text within a `<pre>` tag.