In this example, the Uize.Widget.Drag.Move widget class is being used to wire up a bunch of image thumbnails so that they can be dragged around a "workspace". This is a very basic example of drag-and-drop - there are no drop targets to speak of. Instances of the Uize.Widget.Drag.Move class are wired up for all the thumbnails in a single statement, thanks to the Uize.Widget.Drag.Move.spawn static method. The Uize.Widget.Drag.Move class doesn't deal with managing z-index - just coordinates. It does, however, support coordinates specified in units of px (pixels) as well as % (percent).