This example visualizes a dataset of CSS color hex values by rendering each row as a thin horizontal strip, producing a dense color spectrum. The React component uses `useState` and `useEffect` to load the CSV data asynchronously via d3’s `csv` function, then maps over the rows to create `<div>` elements whose background color comes from the `RGB hex value` column. The visualization relies on React’s declarative rendering rather than D3’s data-join methods, with data fetched from a gist URL.