This example renders a horizontal bar chart of the top 10 countries by 2020 population using React and D3. It shows CSS-loaded data from a CSV file, with axes drawn manually. The code uses D3’s `scaleBand`, `scaleLinear`, and `csv` to fetch and scale data, while React’s `useState` and `useEffect` manage loading and state. SVG elements are generated in JSX, with tick marks and labels positioned via D3’s `ticks()` and the scales’ range.