Dock
describes the direction in which GUI is oriented and to which corner or side of the page it is "docked".
If you are familiar with macOS Dock — here we have the similar concept.
topLeft : Dock
topCenter : Dock
topRight : Dock
middleLeft : Dock
center : Dock
middleRight : Dock
bottomLeft : Dock
bottomCenter : Dock
bottomRight : Dock
anchors : Dock -> ( HorzAnchor, VertAnchor )
horzAnchor : Dock -> HorzAnchor
vertAnchor : Dock -> VertAnchor
toString : Dock -> String