my Bar Chart
This bar chart displays the ten most populous countries in the world for 2020, using horizontal bars sorted by population. The visualization is built with React and D3 v5, using `scaleBand` for the categorical y-axis and `scaleLinear` for the numeric x-axis. Data comes from the United Nations World Population Prospects 2019, loaded via `d3.csv`. Bars are rendered as SVG `<rect>` elements, with D3’s `format` for tick labels and a tooltip on each bar.