This example demonstrates interactive zooming and hover highlighting on a world map rendered with SVG. The map uses D3’s `geoNaturalEarth1` projection and `geoPath` to draw countries from TopoJSON data enriched with country names from a TSV file. A zoom behavior updates the map’s transform on pan and zoom events, while CSS hover states turn countries red. The code relies on D3 v5 and the TopoJSON library to load and convert geographic features.