This example shows a tree diagram with five nodes arranged in a parent-child hierarchy, rendered as circles and labeled text connected by curved links in an SVG. The diagram is built from flat data—an array of objects with `name` and `parent` properties—which is converted into a nested hierarchy using `d3.stratify()`. The layout is computed with `d3.tree()` and `d3.hierarchy()`, while SVG paths and groups are appended manually. It uses D3.js version 7 and is adapted from the D3 Tips and Tricks book.