This example demonstrates how to load external CSV data into a React application using D3’s `csv` method, then display a summary of the dataset’s size and structure. The React `useEffect` hook fetches the CSV from a GitHub gist, storing the parsed data in state via `useState`. Once loaded, the `message` function formats the output using `d3.csvFormat` to calculate file size in kilobytes, alongside row and column counts. The interface shows the text summary inside an HTML `<pre>` element, with a simple “loading” placeholder before data arrives.