This example shows the top 10 most populous countries in the world as a horizontal bar chart, using data from the 2017 United Nations World Population Prospects. It also demonstrates how to customize D3 axes, including removing axis lines, applying custom tick formatting with `d3.format`, and adding an axis label. The chart is rendered with SVG, uses `d3.scaleLinear` and `d3.scaleBand`, and calls `d3.axisLeft` and `d3.axisBottom` to generate the axes.