This example visualizes the 148 named CSS colors as a donut chart, with each slice filled by its corresponding RGB hex value. Using React state to manage data loading, it fetches a CSV via `d3.csv` and renders an SVG through `ReactDOM`. The pie layout is computed with `d3.pie`, while each segment’s path is generated by `d3.arc`, producing a colorful circular spectrum that maps each color name to its visual representation.