This example shows a choropleth map of world countries colored by their economy category, using a spectral color scale. The visualization renders SVG paths via d3.geoPath with a natural Earth projection, while d3.zoom enables panning and zooming. A custom color legend component displays ordinal values with circles and text, and hovering over any country highlights it in red. Data comes from the world-atlas TopoJSON and TSV files, with countries styled using CSS stroke and fill properties.