{"version":"1.0","type":"rich","title":"Tree graph","description":"This example shows a hierarchical tree visualization of COVID-19 data, with a global root branching into continents, countries, and leaf nodes for cumulative confirmed cases, deaths, and recoveries. It uses the D3.js library, specifically the `d3.hierarchy` constructor and `d3.tree` layout, to compute node positions and render an SVG with styled circles and links. The data is embedded directly in the JavaScript, with each country node carrying a numeric value and color attributes that are not visualized further in the displayed output.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/b48dfae8d0454ad499bd092af6b3e3df?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}