When we need to use deep navigation, for example when the user taps on a piece of content from a tabbed view, the header will update to represent the new view.
The page stack (deep navigation) introduces a back button which, when combined with tabs (flat navigation) in the same view, could be misinterpreted as another method for navigating between tabs.
Yes by that we meant not to have a back button and tabs on the same screen. I have updated the description here : http:// design. ubuntu. com/apps/ global- patterns/ navigation
When we need to use deep navigation, for example when the user taps on a piece of content from a tabbed view, the header will update to represent the new view.
The page stack (deep navigation) introduces a back button which, when combined with tabs (flat navigation) in the same view, could be misinterpreted as another method for navigating between tabs.