Polygon
Close original numeric vertices in their source order.
Use polygons for explicit planar regions. Simple concave boundaries are valid. Each named series is one complete simple boundary; the chart does not sort vertices into a new shape.
Supply at least three unique complete id/x/y vertices per nonempty series. X is numeric or UTC time; Y is finite numeric. No nulls, repeated coordinates, zero-area boundaries or self-intersections. The closing edge is automatic; do not repeat the first vertex.
Fixed vertex dots retain original X/Y values. Configure axes, colours, legend, labels, individual detail, pinning, crosshair, references and viewport. Shared tooltip, line-marker controls, point overrides, stacking and custom curve/gaps settings are rejected.