This example renders CSS named colors as a pie chart, with each slice filled by its corresponding hex value. The data loads asynchronously from a CSV file using D3’s `csv` utility, and React’s `useState` and `useEffect` manage the loading state. Once fetched, the `pie` layout partitions the data, and the `arc` generator produces the SVG paths. React maps each arc to a `<path>` element within an SVG container, combining D3’s data transforms with React’s declarative rendering.