This example demonstrates how to load external data in a React application using D3 utilities and manage the resulting state with React hooks. The app fetches a CSV file of CSS named colors from a GitHub gist using `d3.csv`, stores the parsed data via `useState`, and displays summary statistics with `d3.csvFormat`. While loading, it renders “Loading…” before showing the file size, row count, and column count. The visualization uses SVG rendering and combines React’s `useEffect` for data fetching with D3’s parsing capabilities.