This example shows the ten most populous countries grouped by continent, with horizontal bars scaled by population. Each continent appears as a separate band containing its countries, with a title and shared x-axis. The visualization is built with React and D3 v6, using `scaleBand` for country placement, `scaleLinear` for population values, and SVG rectangles rendered via a custom `Marks` component. Data is loaded asynchronously from a CSV file using D3's `csv` method.