A four-state arc diagram in plain SVG — nodes on one sequence-preserving baseline, half-ellipse arcs sized by weight, back-edges below the axis, hover to raise a node's arcs, and a keyboard walk over an sr-only node and arc table.
npx shadcn@latest add @zyeon/chart-arc-diagramZyeon UI limits how often it can be asked, and Arc Diagram hasn't had its turn. Its source will show here once it has.