World Countries Tree
This visualization displays the hierarchical structure of world countries organized by continent and subregion, using a horizontal tree layout. The data, sourced from a JSON file, positions country names with larger text for higher-level regions and smaller text for individual nations. The visualization employs d3.tree and d3.hierarchy to compute the layout, while d3.linkHorizontal generates the curved connecting paths. The SVG rendering supports zooming and panning through d3.zoom, with a Playfair Display font for labels and mint-green colored links against a white background.