This example shows a pie chart of all 148 named CSS colors, with each slice filled by its corresponding hex value. Built with React and D3 v6, it fetches color data from a CSV file using the `d3.csv` function. The chart is rendered as an SVG, where React manages the state and component lifecycle with `useState` and `useEffect`, while D3's `pie` and `arc` functions compute the slice geometries. A loading message displays until the asynchronous data fetch completes.