This example demonstrates a basic world map visualization created with D3.js v5 and TopoJSON. It renders a natural Earth projection of countries as SVG paths, with a blue sphere background and light green country fillings with subtle black strokes. The code uses `d3.geoNaturalEarth1` for the projection, `d3.geoPath` to generate path data, and `topojson.feature` to extract country geometries from the world-atlas dataset. Country boundaries are drawn from the 110m resolution world-atlas TopoJSON file fetched via `d3.json`.