This example shows a horizontal bar chart ranking the top 10 countries by their 2020 population, rendered as SVG rectangles using React elements. The code loads CSV data from a GitHub gist using D3’s `csv` utility, then maps country names to y-coordinates via `scaleBand` and population values to x-widths via `scaleLinear`. Data loading and state management rely on React hooks (`useState`, `useEffect`), while D3 v7 provides the scales and `max` aggregation.