This example displays a horizontal bar chart of the top 10 countries by projected 2020 population, encoded as SVG rectangles. The chart uses D3's `scaleBand` and `scaleLinear` to map categorical country names and numerical population values to pixel coordinates. It loads data from a CSV file via `d3.csv` and renders the visualization with React, applying a margin convention to position the plot area within the SVG canvas. The bars are drawn using the `rect` SVG element, with dimensions derived from the scales.