This example shows a horizontal bar chart of the ten most populous countries in 2020, using React to render SVG elements and D3 for data loading and scales. The App component fetches a CSV from a GitHub gist using `d3.csv`, transforms the population values, and slices the top ten rows. React’s `useState` and `useEffect` manage the asynchronous data, while D3’s `scaleBand` and `scaleLinear` position the bars and axes. Custom tick marks for both axes are generated manually with D3’s `ticks` method, and the chart updates reactively once data arrives.