This example visualizes the top 10 most populous countries as a bar chart using React for component structure and D3 v5 scales for data mapping. The application fetches UN World Population Prospects 2019 data via d3.csv, then renders SVG rectangles whose widths correspond to each nation’s 2020 population estimate. The chart deliberately omits axis labels or tick styling, presenting only raw red tick lines and country names through custom React components like AxisBottom, AxisLeft, and Marks, with y-axis positioning using scaleBand and x-values scaled via scaleLinear.