This example shows a vertical family tree of programming languages, tracing relationships from roots like C and Lisp down to descendants such as Python, Rust, and Clojure. It uses d3.stratify to convert flat parent-child data into a hierarchy, then d3.tree with d3.linkVertical to position nodes and draw curved links. Circles are colored by depth, with labels placed above each node, rendered as SVG in a static layout.