This example displays a hierarchical tree of world countries organized by continent and subregion. A cluster layout from D3 v5 positions nodes in a branching structure, with horizontal links rendered as SVG paths. Animated stroked paths with a dashed pattern flow along the links to create a directional dataflow effect, while text labels show each country’s name with font sizes varying by tree depth. The visualization uses `d3.hierarchy`, `d3.cluster`, `d3.linkHorizontal`, and CSS keyframe animations, loading data from a static JSON file.