This example displays a static world map rendered as gray SVG paths, with each country drawn as a separate geographic feature. The visualization loads GeoJSON data from a local `countries.json` file and uses `d3.geoPath()` to project the coordinates onto a 500×500 pixel canvas. The code applies a uniform gray fill to every country, with no interactivity or styling variations. It relies on D3 v5’s selection and data-join methods (`svg.selectAll("path").data(data.features)`) to create the map elements from the GeoJSON structure.