Stylized Bar Chart
Top 10 most populous countries appear as horizontal bars, sorted by country name on the y-axis and population count on the x-axis. Built with React and D3 v5, the chart uses `scaleBand` and `scaleLinear` to position bars, with SVG `<rect>` elements rendering the marks. Data comes from the United Nations World Population Prospects 2019, formatted with D3’s `format` to display billions using "B" suffixes.