Bar Chart Basic
A horizontal bar chart displays population figures for ten countries, using data from a local CSV file. The chart initializes D3 via a CDN and employs D3's `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom` modules to map population values to bar lengths and country names to vertical positions. Bars render as SVG rectangles with a steelblue fill. Axis tick labels are formatted with `format('.3s')`, converting large numbers into readable values with "B" suffixes.