This example visualizes the top 10 most populous countries from a United Nations 2019 dataset using horizontal bars. The chart renders with React and D3 v7, computing linear and band scales via `scaleLinear` and `scaleBand` to map population values and country names. Axis ticks and labels are generated from the scales’ tick methods, with SVG rectangles representing each country’s population, drawn within an SVG canvas sized to the browser window.