This example visualizes CSS color data as a sequence of horizontal bars, each displaying a named color’s RGB hex value as its background. The app loads the dataset from a GitHub Gist using D3’s `csv` utility, then stores it in React state via the `useState` and `useEffect` hooks. Each row is rendered as a `div` element with inline styles for width and height, effectively creating a color swatch list. React 16.9 and D3 v7 are used together, with SVG elements commented out in the HTML template.