Stylized Bar Chart
This stylized bar chart displays the top 10 most populous countries for 2020, using horizontal bars to compare population sizes. The visualization is built with React and D3 v5, employing `scaleBand` and `scaleLinear` for positioning, with SVG rectangles rendered as marks. Data comes from the United Nations World Population Prospects 2019 dataset, loaded via `d3.csv`. Hovering over a bar reveals a tooltip with the population value, formatted using `d3.format` to show abbreviations like "B" for billions.