This example renders a donut chart of CSS named colors, with each slice sized equally and filled using the color’s hex value from a CSV dataset. The code combines React state and hooks—`useState`, `useEffect`, and `useCallback`—with D3 utilities `csv`, `pie`, and `arc` to load data and compute path geometries. SVG paths are generated inside a React component, while the chart is centered via a `<g>` transform. Loading feedback displays the text "Loading..." until the CSV arrives.