This example shows the top 10 most populous countries as a horizontal bar chart, with country names on the y-axis and population values on the x-axis. Built with React and D3 v5, it uses `scaleBand` for the categorical y-axis, `scaleLinear` for the numeric x-axis, and manually renders axis ticks with SVG `<line>` and `<text>` elements. Data comes from the United Nations World Population Prospects 2019 CSV, loaded asynchronously via `d3.csv`, and bars are drawn as `<rect>` elements inside an SVG container.