This example displays a hierarchical family tree of an employee’s contacts, departments, and locations using a node-link diagram. The visualization uses D3.js (v5) with the `tree` and `hierarchy` APIs to compute the layout, while custom SVG `path` elements draw curved links between nodes. Each node’s radius reflects its `value`, and stroke and fill colors correspond to the `type` and `level` fields from the embedded JSON data. The chart is rendered in an SVG canvas with `d3.select` and `d3.append`, and node labels are positioned dynamically based on depth.