World Countries Tree
This visualization displays a hierarchical tree of world countries, starting with the root "World" node and branching down through "Asia" and "Southern Asia" to individual nations such as Afghanistan, India, and Pakistan. The d3.hierarchy and d3.tree layout compute the node positions, while d3.linkRadial generates curved connection paths between parent and child nodes. Rendered as SVG, the diagram also incorporates a d3.zoom interaction that allows users to pan and scale the entire tree. Node labels are positioned dynamically based on depth, with font sizes decreasing for deeper hierarchy levels, all styled using the Playfair Display font from the linked Google Fonts stylesheet.