This bar chart displays the population of the top 10 most populous countries from the 2018 United Nations World Population Prospects estimate. It demonstrates customized D3 axes, including a bottom axis with abbreviated tick labels (converting billions to “B”) and a left axis with removed domain and tick lines. The code uses D3 v5 APIs such as `csv`, `scaleLinear`, `scaleBand`, `axisBottom`, and `axisLeft`, rendering SVG elements inside a fixed-width viewport. Custom tick formatting and axis label styling are applied via the `format` module and CSS.