{"version":"1.0","type":"rich","title":"Untitled","description":"This example displays a choropleth map of the United States with counties rendered as SVG paths, filled in light gray and highlighted in light blue on hover. The code loads a TopoJSON file of US counties from a remote GitHub repository and uses `d3.geo.mercator` with a fitted projection to size and position the map within the viewport. Counties are drawn via `d3.geo.path`, and the script references an additional tooltip feature using `d3.tip` in the accompanying test.js file, though that tooltip is not implemented in the visible code. The map is rendered entirely with D3 v3 and SVG.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/b5a775899ae74e07866a30e3f3225e0c?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}