Navigation mode should work properly on scrollable iframes/divs and fixed position divs

[jasenk]

Scenarios:

1. scrollable iframe

• main app is scrollable and content inside iframe is scrollable
• there are navigation mode elements inside and outside the iframe
• Advertising SDK uses this
  2) scrollable divs
• main app is scrollable and content inside divs are scrollable
• there are navigation mode elements inside and outside the div
  3) scrolling through a page with fixed position divs