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This D3.js v7 example visualizes country population and area data from a GitHub-hosted CSV file. It shows a bar chart of populations with value labels, alongside a data summary and a data table. The code uses `d3.scaleBand`, `d3.scaleLinear`, `d3.axisBottom`, and `d3.axisLeft` to construct the SVG chart, plus `d3.format` for number formatting. The visualization also provides a computed summary of total population and the largest country by area.