This zoomable sunburst visualization displays hierarchical data from the Flare dataset, using an interactive radial layout where each ring segment represents a node’s value. The chart supports click-to-zoom transitions with smooth animations, implemented in D3 v5 with SVG rendering. The dataset is loaded from a CSV and nested into a hierarchy, with color encoding by branch depth. Users can explore the hierarchy by clicking arcs to zoom into nested levels, with the animation providing a smooth transition between views. The example is a port of Mike Bostock’s Observable notebook and serves as a practical reference for adapting D3 v5 to vanilla JavaScript.