A choropleth map of world GDP in trillions of USD, colored on a red scale from light to bright red, with country boundaries in white and a graticule overlay. It uses D3 v7’s `d3.geoNaturalEarth1` projection and `d3.geoPath` to render the SVG, with TopoJSON data for country shapes. A hover tooltip displays country-specific GDP values from a hardcoded dataset.