Customizing Axes
This bar chart displays the top 10 most populous countries using 2018 United Nations population estimates. It highlights how D3 axes can be customized, including tick formatting, offset tick lines, and the removal of axis domains. The chart uses `d3.csv`, `scaleLinear`, `scalePoint`, `axisBottom`, `axisLeft`, and `format`, with population values multiplied by 1,000 and formatted in billions. Circles mark each country, and the axes include labeled ticks and a title, all rendered as SVG elements.