Insert overlay content as a child of another.
A child overlay is bound to its parent overlay, so if the parent is removed, the child should be removed too.
Parent node for the new overlay.
Child node; overlay to add. Same restrictions apply as for addOverlay.
Type of the overlay as a fallback sequence.
addOverlay
See Implementation
Insert overlay content as a child of another.
A child overlay is bound to its parent overlay, so if the parent is removed, the child should be removed too.