A series of widget types that are only useful to handle display of subwidgets, or just add tags surrounding other widgets.
The container widget is a "decorative" widget, used to control rendering of its subwidgets. It's available since Nuxeo 5.6 and is used on the default Summary layout.
View online demo: http://layout.demo.nuxeo.org/nuxeo/layoutDemo/containerWidget
This widget defines a drop zone, used to define a zone where some actions will be called on drop. The Drag and Drop Service for Content Capture (HTML5-Based) documentation details how it can be used.