Making a Bar Chart
This bar chart displays the population of the world’s most populous countries, ranked vertically from China to Slovenia, with horizontal bars indicating relative population sizes. It uses D3 v5’s `scaleLinear` and `scaleBand` to map population values and country names, respectively, while rendering as SVG. The code loads CSV data via `d3.csv`, applies a custom tick formatter to abbreviate large numbers (e.g., converting billions), and styles bars with steelblue fill.