This example shows a donut chart of CSS named colors, with each slice representing one color from a CSV dataset loaded via React’s `useEffect` hook. The visualization uses `d3.pie()` to compute slice angles and `d3.arc()` with an inner radius of 0 and outer radius set to the viewport width, rendering each segment as an SVG `<path>` filled with the corresponding hexadecimal value from the data. The chart is centered within a 960×500 SVG canvas, with data fetched asynchronously from a remote gist URL and displayed only after the CSV loads.