D3 Axes
This bar chart ranks the ten most populous countries, from China to Mexico, using horizontal bars scaled by population. The chart labels each country on the y-axis and formats population values in billions on the x-axis. Built with D3 v5, the visualization uses `d3.scaleLinear` and `d3.scaleBand` for scales, `d3.axisBottom` and `d3.axisLeft` for axes, and loads data from a local `data.csv` file. The x-axis gridlines extend across the chart, with the country names and title styled via CSS.