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World Countries Tree
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Description
This visualization displays the hierarchical structure of world countries organized by continent and subregion, using a D3 tree layout rendered as an SVG. The code applies `d3.tree`, `d3.hierarchy`, and `d3.linkHorizontal` to position nodes and draw curved links, with zoom support via `d3.zoom`. Country names appear as text labels sized by depth, and the data comes from a JSON file reflecting geographic classifications.
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