Combo Chart (Dual Axis)
ProA four-state bar-plus-line combo chart whose two axes are built from one shared row structure, so a zero reading lands on the same gridline in both units and no gridline is meaningful on only one scale.
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This component is part of Pro
The install command, prompt and concept map are included with a Pro license — one purchase unlocks every Pro component, forever.
Arc Diagram
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.
Legend Toggle
A standalone, controlled chart legend — aria-pressed chips in a roving-tabindex toolbar, double-click or Enter to isolate one series, show-all / hide-all, and a guard that keeps the last series from blanking the chart.