This interactive tree diagram visualizes a hierarchical dataset of defect categories, priorities, and related items. The graph.csv data is loaded with d3.csv, converted into a tree structure, and rendered as collapsible nodes and links using d3.layout.tree and d3.svg.diagonal. Clicking a node toggles its children, with transitions smoothly animating position changes via d3’s transition methods. The SVG output uses circle nodes and bold labels, with lightsteelblue indicating collapsed branches.