This example shows a horizontal bar chart of student marks, ranking the top 10 students by their scores. The visualization uses React hooks (`useState`, `useEffect`) to load CSV data via `d3.csv`, then renders SVG rectangles scaled with `d3.scaleBand` and `d3.scaleLinear`. Axes are drawn manually using mapped tick values rather than D3 axis generators, with React creating the SVG elements. The chart updates reactively as data loads, displaying a loading message until the CSV arrives from the GitHub gist URL.