This interactive tree diagram visualizes a hierarchical dataset of muscle car models, starting from the root "Muscle Cars" and branching through Ford and Dodge to specific models like Mustang, Charger, and Hellcat. Built with D3 v3 and rendered as SVG, it uses the `d3.layout.tree` API to position nodes and branches, with CSS styling controlling colors, strokes, and tooltips. The visualization supports animations, node clicking, zooming, and dragging, with JSON data loaded from Tree.json.