OptionalclassOptionalcornerOptionaldefaultOptionalfocusDisplay label for the focus (defaults to the id).
OptionalmaxOptionalpositioning9.20: "absolute" anchors the popout inside a positioned ancestor (the graph view), instead of the viewport, so it sits over the canvas corner rather than whatever chrome happens to occupy the viewport corner. Default stays "fixed" for existing consumers.
The full graph the neighborhood is cut from.
Corner the popout docks to (default bottom-left).