This example shows a collapsible tree diagram where each node is a colored box with wrapped text, representing hierarchical company data from a JSON file. The visualization uses D3.js v3 with `d3.layout.cluster` and `d3.behavior.zoom` to enable panning and zooming, while jQuery supports tooltip interactions. Node colors correspond to different item types (type1 through type5), and clicking nodes toggles the expansion of their children. The SVG is rendered with custom CSS for box styling, arrows, and selectable links.