Using React 17 with hooks and D3 v6, this example loads CSS color names and their RGB hex values from a GitHub-hosted CSV via D3's `csv` method. The app displays each color as a thin 960-pixel-wide horizontal bar, stacking them vertically to form a complete spectrum. A conditional `useEffect` hook fetches the data asynchronously, and React renders the loading state with a `pre` element until the dataset arrives. The visualization simply maps each CSV row to a colored `div`, showing the full range of named CSS colors in a single view.