This example displays a world map using D3.js v5 and TopoJSON, rendering countries as red SVG paths with blue strokes on a green spherical backdrop. It uses `d3.geoEquirectangular` for the projection and `d3.geoPath` to generate the country shapes from the `world-atlas` dataset’s countries-110m.json file. Hovering over a country changes its fill color to brown, highlighting individual nations.