This example shows an interactive world map rendered with SVG, where country boundaries appear in light green and turn red on hover, with a blue sphere background. It uses `d3.geoNaturalEarth1` for projection and `d3.geoPath` to draw geographic features from TopoJSON data loaded via `d3.json`. Country names come from a TSV file accessed with `d3.tsv`. The map supports pan and zoom through `d3.zoom`, applying the current transform to a group element containing all countries.