This example demonstrates how to load CSV data in a React application using D3’s `csv` utility and manage it with the `useState` and `useEffect` hooks. It displays a text summary showing the data size in kilobytes, row count, and column count via a custom `message` function. The visualization uses `d3.csvFormat` to compute file size and React 17 with D3 v7, fetching data from a GitHub gist URL. While loading, the interface shows a “Loading...” message before rendering the statistics.