Customizing Axes
This bar chart displays the population of the top 10 most populous countries, based on 2018 estimates from the United Nations World Population Prospects. It demonstrates customizing D3 axes: the y-axis has its domain line and tick lines removed, while the x-axis uses a tick format function to abbreviate large numbers and adds a custom axis label. The chart uses `d3.csv`, `scaleLinear`, `scaleBand`, `axisBottom`, and `axisLeft`. Population values are multiplied by 1000, and bars are rendered as SVG rectangles with steelblue fill.