This example displays an interactive world map using SVG paths generated from TopoJSON data. The visualization uses d3.geoMercator, d3.geoPath, and the `topojson` feature function to render country boundaries with a steelblue fill and black strokes. Hovering over a country triggers a CSS `:hover` rule that changes the fill to red, and d3.zoom enables pan and zoom interactions that transform the map group. Country name tooltips are added via the `title` child element, using data from a TSV file.