This example displays the top 20 most populous countries as a bar chart, with horizontal bars rendered as SVG rectangles. It deliberately omits axes, instead using gridlines and tick labels from `scaleLinear` and `scaleBand` to convey values. The chart is built with React functional components and hooks, while D3 v5 handles data loading via `csv`, scaling, and tick generation. Population figures come from the United Nations World Population Prospects 2019 dataset.