This example shows a React application that renders CSS named colors as horizontal stacked bars, using each color’s RGB hex value as the background. The data comes from a CSV file fetched with `d3.csv`, and the component uses React’s `useState` and `useEffect` hooks to manage the asynchronous loading state. Once loaded, the app maps each row to a `<div>` element with a fixed width and height, displaying a loading message via a `<pre>` tag before data arrives. The visualization relies on React’s declarative rendering rather than explicit D3 drawing methods.