This example displays a world map rendered as SVG paths, colored grey with thin white stroke lines separating countries. The map uses the Mercator projection, centered on the prime meridian and rotated to show the eastern hemisphere. Users can pan and zoom interactively via a d3.zoom handler, which applies a transform to the grouped country paths during the zoom event. The geographic data comes from a TopoJSON file loaded with d3.json, and the features are extracted using topojson.feature before being drawn with d3.geoPath. The projection is configured with d3.geoMercator, and the zoom scale is restricted to a range of 1 to 8.