OptionalafterOptionalbeforeSpecify a callback executed before the toolbar instance DOM element gains focus upon the Alt + F10 keystroke.
OptionalisSet true if the toolbar is attached to the content of the editor. Such toolbar takes
a precedence over other toolbars when a user pressed Alt + F10.
Specify a callback executed after the toolbar instance DOM element loses focus upon Esc keystroke but before the focus goes back to the ~EditorUI#setEditableElement editable element.