Note: This is not a real constructor, but just a description of the type of object that should be passed as
a parameter to some method(s), and/or the return value from some method(s).
In other words, the type exists only for documentation purposes, and you cannot call new Moveable.__MoveableArgs()
See the dojo/dnd/Moveable.__MoveableArgs reference documentation for more information.
A node (or node's id), which is used as a mouse handle. If omitted, the node itself is used as a handle.