d3 tree
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A radial tree diagram displays a hierarchical dataset of world regions and countries, with nodes positioned by depth and branches extending outward. The visualization uses D3.js v5 to parse the JSON data and render the structure as an SVG, with text labels for each node. The code applies `d3.tree`, `d3.hierarchy`, and `d3.linkHorizontal` for layout, and includes zoom interaction via `d3.zoom` to navigate the tree.
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