This example displays a world map rendered as black countries with white borders on an SVG canvas. It uses D3.js version 5 and the `d3.geoMercator()` projection to transform geographic coordinates, with `d3.geoPath()` drawing the country boundaries. The map data is loaded from a GeoServer WFS endpoint as GeoJSON, which is then converted to TopoJSON via the `topojson` library to structure the geometries for rendering. The visualization showcases D3’s ability to handle geographic data through its projection and path APIs.