This bar chart displays the top 10 most populous countries in 2018, using population data from the United Nations World Population Prospects. The chart demonstrates custom axis styling, including reformatted tick labels that convert values from gigabytes to billions, extended tick lines across the plot area, and removed default axis domains. Built with D3 v5, it uses `scaleLinear` and `scaleBand` for scaling, `axisBottom` and `axisLeft` for axes, and `format` to customize tick labels. The SVG rendering includes custom fonts and colors applied through CSS.