{"version":"1.0","type":"rich","title":"World Countries Tree","description":"This visualization displays the hierarchical structure of world countries organized by continent and subregion, using a D3 tree layout rendered as an SVG. The code applies `d3.tree`, `d3.hierarchy`, and `d3.linkHorizontal` to position nodes and draw curved links, with zoom support via `d3.zoom`. Country names appear as text labels sized by depth, and the data comes from a JSON file reflecting geographic classifications.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/4f92c793909f48d28012e43ddab716df?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}