{"version":"1.0","type":"rich","title":"Toggle topojson layers (change visibility)","description":"Clicking toggles visibility of countries from a TopoJSON world map, which are rendered as SVG paths using d3.geoPath with a Robinson projection. The `countries.json` TopoJSON file is loaded with d3.json, converted to GeoJSON, and each country is drawn as a separate path element in an SVG group. A button enables users to show or hide all country layers simultaneously by toggling the CSS visibility of the group, while preserving the map's layout and interactivity.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-0cc5dfb9eedba7afd6712303fb983533?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}