I would like to make a dashboard viewable to a user where he doesn't get the navigation frame with "back", "workbook" and such options.
Kind of like what you get with .png added to the address, but I still want to allow interaction with quick filters.
Another drawback with png is that the user may realise he can request without png and then see the navigation frame.
Use the value from the Email or Embed in the Share link:
For our Microsoft SharePoint site I use a Web Form and populate the Source Editor with the Embed code that you get from the viz's Share link. I have to do it this way because the company I'm working for refuses to allow outside functionality, even though Tableau has a good SharePoint web part.