{"version":"1.0","type":"rich","title":"World Countries Tree","description":"A hierarchical tree visualizes the structure of world countries grouped by continent and subregion. The layout uses `d3.tree` and `d3.hierarchy` to position nodes, with `d3.linkHorizontal` generating curved link paths. Text labels display country names with font size decreasing by depth. Pan and zoom functionality is implemented via `d3.zoom`. Data comes from a local `data.json` file, rendered as SVG with a teal stroke and Playfair Display font.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/54da50ff683545f89486fccaba55adad?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}