This tree diagram visualizes LinkedIn job postings, organized hierarchically by job sector, location, and employment type. The visualization uses D3.js v7 to render an SVG with a custom layout, where nodes are styled by depth level: black diamonds for the root, purple circles for sectors, orange squares for locations, and blue stars for job types. The code applies d3.hierarchy and d3.tree to structure the dataset, with horizontal links drawn using d3.linkHorizontal.