This example displays a pie chart of CSS named colors loaded from a CSV file, with each slice filled by its corresponding RGB hex value. The visualization uses React hooks (useState, useEffect) to fetch the data via d3.csv and manage the loading state, while d3.pie and d3.arc compute the slice geometry. Each slice is rendered as an SVG path element controlled by React’s declarative JSX syntax. The chart uses an outer radius equal to the full width, creating a semicircular donut shape.