Fork of D3.js collapsible tree with boxes
This interactive visualization presents a hierarchical tree layout using D3.js v3, where each node is rendered as a colored rectangular box with text labels. The tree structure shows parent-child relationships with directional links that highlight the connection type between nodes. Built with `d3.layout.tree` and SVG rendering, the visualization features collapsible nodes, smooth animated transitions, and support for zooming and dragging via `d3.behavior.zoom`. The code demonstrates custom arrow definitions, drop shadows, and tooltips, with JSON data driving the node hierarchy and metadata such as node types, versions, and link directions.