Get the document that this node is currently rendered in (the document of the main window or of a popout window). Returns undefined before the layout has been mounted.
Get the browser window that this node is currently rendered in. This is the main window for nodes in the main layout and the popout window for nodes rendered inside a popout. Returns undefined before the layout has been mounted.
A group of tabs rendered as a colored pill in a tab strip (Chrome style). A group is a child of a TabSetNode or BorderNode and holds TabNode children; it has a name, a color and an opened/closed (collapsed) state. When closed only the pill is shown.