{"version":"1.0","type":"rich","title":"Fork of Tree","description":"A fork of a three-layer D3 v7 tree visualization renders a hierarchical dataset of continents, countries, and cities using SVG. The code builds a vertical tree layout with `d3.hierarchy` and `d3.tree()`, then draws curved links with `d3.linkVertical()`. Node shapes encode depth: rounded rectangles for the root and countries, diamonds for continents, and circles for leaf cities, with a legend explaining each.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/240fbb1bff954ee2be0bba6b8b0232a5?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}