This example shows a horizontal bar chart of the ten most populous countries in 2020, with each bar’s length proportional to population. The visualization uses React to render SVG rectangles inside a `<g>` element translated by a margin object, while D3’s `csv` loads and parses the UN population data. `scaleBand` maps country names to vertical positions, and `scaleLinear` scales population values to bar widths within the inner chart dimensions. The chart omits axes and labels, focusing purely on the margin convention.