World test
This visualization displays a world map with countries colored light green against a blue sphere, using natural Earth projection. Hovering over a country turns it red, and users can zoom and pan the map interactively. The code loads TopoJSON and TSV data from the world-atlas package, converting TopoJSON to GeoJSON via topojson.feature and rendering paths with d3.geoPath. Zoom behavior comes from d3.zoom, while country names are joined from the TSV file and shown as SVG title tooltips.