This example displays the top 10 most populous countries as a horizontal bar chart, with axes manually constructed using React and D3 v5. The chart shows population values on a linear x-axis and country names on a band y-axis, both built from `d3.scaleLinear` and `d3.scaleBand`. Data comes from the United Nations World Population Prospects 2019, loaded via `d3.csv`. The visualization renders as SVG, with tick marks and labels generated by mapping over `xScale.ticks()` and the y-scale domain.