Making a Bar Chart
This bar chart visualizes the top 10 most populous countries using 2018 population estimates from the United Nations World Population Prospects. It highlights the customization of D3 axes, including a formatted x-axis tick label that converts population numbers into billions, and a cleaned-up y-axis with tick lines removed. The chart uses d3.scaleLinear and d3.scaleBand for positioning, d3.axisBottom and d3.axisLeft for axis generation, and d3.csv to load the data from a CSV file with populations multiplied by 1,000. Rendering is done via SVG.