This example demonstrates a React component that loads a CSV file of CSS named colors using D3’s `csv` utility, storing the result in React state via `useState` and `useEffect`. It displays a summary of the fetched data—file size in kilobytes, row count, and column count—using D3’s `csvFormat` to calculate the byte length. The message updates asynchronously after the data resolves, with a “Loading…” placeholder shown initially. The code runs in a browser with React 17 and D3 v7.