This example shows a hierarchical tree of world countries, organized by continent and subregion, using a tidy tree layout. The visualization uses a horizontal dendrogram where nodes are labeled with country names, and links are drawn with D3's `linkHorizontal` path generator. The code imports functions like `tree`, `hierarchy`, and `zoom` from the `d3` module, and loads data from a JSON file. Text styling includes a custom Spirax font and white text shadow for readability.