This example displays a LinkedIn job posting hierarchy as a tree diagram, with root, category, location, and job-type levels. It uses D3.js v7 with a hierarchical tree layout and horizontal links. Nodes are rendered as distinct SVG shapes—diamonds, circles, rectangles, and stars—based on depth, with labels positioned relative to child presence. The code uses `d3.hierarchy`, `d3.tree`, and `d3.linkHorizontal`, with hardcoded data for cities and employment types.