This example visualizes CSS named colors by rendering each color as a horizontal stripe, creating a full-spectrum block of 148 color swatches. The code loads color data from a CSV file using D3’s `csv` utility, then uses React’s `useState` and `useEffect` hooks to fetch and store the data. React renders each row as a `div` with the background color set to the `RGB hex value` field, producing a stacked display of all named colors.