This example visualizes the top 10 most populous countries as a horizontal bar chart, with the y-axis listing countries and the x-axis showing population counts. The chart uses React hooks (useState, useEffect) to fetch data from the United Nations World Population Prospects 2019 CSV, while D3 v5 provides the scaleBand and scaleLinear for positioning. Axes are manually constructed with D3’s tick generation and rendered as SVG elements, including vertical grid lines and text labels. The bars are simple SVG rectangles, with the chart wrapped in a React component and rendered via ReactDOM.