Making a bar chart
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This example shows a horizontal bar chart ranking the populations of ten countries, scaled by thousands. The visualization uses D3 v5 with SVG rendering, reading data from a CSV file and mapping population values to bar widths via `d3.scaleLinear` and country names to `d3.scaleBand`. The code demonstrates data loading with `d3.csv`, appending rectangles to the SVG, and applying margins to position the chart. No axes or labels are drawn, focusing purely on the bar geometry.
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