2.1.83 [W3C-HTML52] Section 6.6.1. The session history of browsing contexts

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V0236: Nested browsing contexts share a session history

The specification states:

 ... The session history of browsing contexts
     ...
     The sequence of Documents in a browsing context is its session history. Each browsing 
     context, including nested browsing contexts, has a distinct session history. ...

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Nested browsing contexts share a session history.