This example shows a horizontal bar chart of the top 10 most populous countries, with population values displayed in abbreviated form (e.g., “1.41B” for China) using a custom axis format. The chart uses d3.csv to load the data, d3.scaleLinear and d3.scaleBand for positioning, and d3.axisBottom with a tick format function that converts large numbers using d3.format. The SVG rendering is set up in index.html with margins applied to the chart group.