A black-background family tree visualizes a branching hierarchy of ten characters using animated SVG circles and lime-green connecting paths. The code applies D3 v6’s `d3.stratify()` to transform a flat parent-child dataset into a tree structure, then uses `d3.tree()` to compute node coordinates. Links animate via `transition().duration(1000)` on path `d` attributes, while descendant nodes fade in with `transition().duration(800)` on radius. Node labels appear as bold black text, with data defined inline in the script.