This example shows a vertical stack of colored horizontal bars representing CSS named colors from a CSV file, loaded via the `d3.csv` utility. The React `useState` and `useEffect` hooks manage the asynchronous data loading and trigger a re-render once the data arrives. Each row displays a bar with its background color set to the `RGB hex value` column. While the data loads, a simple "Loading..." message appears. The code uses React 16.9, D3 v5, and renders divs directly through `ReactDOM.render`.