AccumulatedVisualContext Tree:
  [1] scroll_frame_id=1 (PaintableWithLines(BlockContainer<PRE>#out))
    [2] clip=[10,10 150x150]
      [3] scroll_frame_id=2 (PaintableWithLines(BlockContainer(anonymous)))
        [4] transform=[1,0,0,1,20,20] origin=(110,110) (PaintableWithLines(BlockContainer<DIV>.transformed))

DisplayList:
SaveLayer@0
  CompositorWheelHitTestTarget@0 target_scroll_frame_index=0 rect=[0,0 800x600]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[0,0 800x175]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[8,8 784x154]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[8,8 154x154]
  FillPath@1 path_bounding_rect=[8,8 154x154]
  CompositorWheelHitTestTarget@4 target_scroll_frame_index=0 rect=[10,10 200x200]
  FillRect@4 rect=[10,10 200x200] color=rgb(144, 238, 144)
  DrawGlyphRun@4 rect=[10,10 185x18] translation=[10,23.796875] color=rgb(0, 0, 0)
Restore@0

