This example visualizes the 148 named CSS colors from the MDN color reference as a vertical strip of colored horizontal bars. Each bar’s background color is set directly from a row in the CSV data loaded via `d3.csv`. The visualization uses React components with hooks (`useState`, `useEffect`, `useCallback`) to manage asynchronous data loading and render the bars dynamically. The page initially displays “Loading…” until the data arrives, and each bar is 960 pixels wide by 4 pixels tall, creating a compact color spectrum.