Customizing Axes
This horizontal bar chart displays the top 10 most populous countries using 2018 United Nations estimates. It shows how D3 axes can be customized by removing gridlines and domain paths, adding a pink axis label, and formatting population values using `d3.format('.3s')`. The chart uses `d3.scaleLinear` for the x-axis and `d3.scaleBand` for the y-axis, rendered as SVG via D3 v5.