Optional ReadonlymarkerThe attrs selector that holds the marker definitions.
Optional ReadonlymodeWhich side of an element or port each link end attaches to; see LinkMode for how each value behaves.
Optional ReadonlysourceOffset (in px) applied to the connection point at the source end.
Optional ReadonlystraightFall back to a straight line while either end is still unconnected (e.g. mid-drag).
Optional ReadonlytargetOffset (in px) applied to the connection point at the target end.
Options for linkRoutingSmooth.