This example presents a horizontal bar chart of the ten most populous countries, using data from the United Nations World Population Prospects 2019. It employs React for component structure and d3.scaleBand and d3.scaleLinear for layout, rendering SVG rectangles via a custom Marks component. Axes are built with d3’s scale ticks, and numeric labels use d3.format to convert values to billions. The chart includes a loading state and tooltips via SVG title elements.