This D3 v5 zoomable sunburst chart visualizes the hierarchical structure of the Flare software project, using nested arcs where each ring represents a level in the tree and arc angles are proportional to each node's value. The example, ported from an Observable notebook, loads the data from the `@observablehq/flare` library and renders it using SVG. User interactions trigger the `clicked` function, which sets new target values for the `d3.partition()` layout and uses `g.transition().duration(750)` along with `attrTween` on the path elements to animate the zoom across its layered structure.