Scrolling content
Fixed background
Scrolling content
Fixed background
Before toggle:

(Frame scrolling node
  (scrollable area size 785 600)
  (contents size 785 665)
  (scrollable area parameters
    (horizontal scroll elasticity 2)
    (vertical scroll elasticity 2)
    (horizontal scrollbar mode 0)
    (vertical scrollbar mode 0)
    (allows vertical scrolling 1))
  (Scrolling on main thread because: Has slow repaint objects)
  (layout viewport at (0,0) size 785x600)
  (min layout viewport origin (0,0))
  (max layout viewport origin (0,65))
  (behavior for fixed 0)
  (children 2
    (Overflow scrolling node
      (scrollable area size 405 305)
      (contents size 410 1020)
      (scrollable area parameters
        (horizontal scroll elasticity 0)
        (vertical scroll elasticity 0)
        (horizontal scrollbar mode 0)
        (vertical scrollbar mode 0)
        (allows horizontal scrolling 1)
        (allows vertical scrolling 1))
    )
    (Overflow scrolling node
      (scrollable area size 405 305)
      (contents size 410 1020)
      (scrollable area parameters
        (horizontal scroll elasticity 0)
        (vertical scroll elasticity 0)
        (horizontal scrollbar mode 0)
        (vertical scrollbar mode 0)
        (allows horizontal scrolling 1)
        (allows vertical scrolling 1))
      (Scrolling on main thread because: Has slow repaint objects)
    )
  )
)


After toggle:

(Frame scrolling node
  (scrollable area size 785 600)
  (contents size 785 665)
  (scrollable area parameters
    (horizontal scroll elasticity 2)
    (vertical scroll elasticity 2)
    (horizontal scrollbar mode 0)
    (vertical scrollbar mode 0)
    (allows vertical scrolling 1))
  (Scrolling on main thread because: Has slow repaint objects)
  (layout viewport at (0,0) size 785x600)
  (min layout viewport origin (0,0))
  (max layout viewport origin (0,65))
  (behavior for fixed 0)
  (children 2
    (Overflow scrolling node
      (scrollable area size 405 305)
      (contents size 410 1020)
      (scrollable area parameters
        (horizontal scroll elasticity 0)
        (vertical scroll elasticity 0)
        (horizontal scrollbar mode 0)
        (vertical scrollbar mode 0)
        (allows horizontal scrolling 1)
        (allows vertical scrolling 1))
      (Scrolling on main thread because: Has slow repaint objects)
    )
    (Overflow scrolling node
      (scrollable area size 405 305)
      (contents size 410 1020)
      (scrollable area parameters
        (horizontal scroll elasticity 0)
        (vertical scroll elasticity 0)
        (horizontal scrollbar mode 0)
        (vertical scrollbar mode 0)
        (allows horizontal scrolling 1)
        (allows vertical scrolling 1))
    )
  )
)


After removal:

(Frame scrolling node
  (scrollable area size 785 600)
  (contents size 785 665)
  (scrollable area parameters
    (horizontal scroll elasticity 2)
    (vertical scroll elasticity 2)
    (horizontal scrollbar mode 0)
    (vertical scrollbar mode 0)
    (allows vertical scrolling 1))
  (layout viewport at (0,0) size 785x600)
  (min layout viewport origin (0,0))
  (max layout viewport origin (0,65))
  (behavior for fixed 0)
  (children 2
    (Overflow scrolling node
      (scrollable area size 405 305)
      (contents size 410 1020)
      (scrollable area parameters
        (horizontal scroll elasticity 0)
        (vertical scroll elasticity 0)
        (horizontal scrollbar mode 0)
        (vertical scrollbar mode 0)
        (allows horizontal scrolling 1)
        (allows vertical scrolling 1))
    )
    (Overflow scrolling node
      (scrollable area size 405 305)
      (contents size 410 1020)
      (scrollable area parameters
        (horizontal scroll elasticity 0)
        (vertical scroll elasticity 0)
        (horizontal scrollbar mode 0)
        (vertical scrollbar mode 0)
        (allows horizontal scrolling 1)
        (allows vertical scrolling 1))
    )
  )
)