A tree diagram displays a hierarchical classification of electronics, branching from "Electronics" into "Display," "Audio," and "Non-display," which further splits into "Fan," "AC," and "Fridge." This example uses D3 v2's `d3.layout.tree` and `d3.svg.diagonal` to compute node positions and draw connecting links on an SVG canvas. Nodes are color-coded by category (yellow for root, pink for main branches, purple for leaves) and interactive tooltips appear on mouseover. The visualization is rendered as static SVG, not animated, despite the metadata listing "animation."