This example shows a minimal HTML page that loads D3 v5 and TopoJSON from a CDN, with a commented-out map projection setup for rendering geographic data. The code creates an SVG canvas and uses `d3.json` to fetch world-atlas data, logging the result to the console. While the map rendering logic using `geoMercator` and `geoPath` is present but inactive, the starter demonstrates the basic structure for building a data visualization with external libraries in a plain HTML context.