This example displays the top 10 most populous countries as horizontal bars, with the x-axis formatted using D3’s `format` to abbreviate large numbers (e.g., “B” for billions). It fetches data from a CSV hosted on GitHub using `d3.csv` and renders SVG elements with React. The chart encodes population via bar width on a `d3.scaleLinear` and country names on a `d3.scaleBand`, with axis components generated from custom React components that leverage D3 ticks.