AccumulatedVisualContext Tree:
  [1] scroll_frame_id=1 (PaintableWithLines(BlockContainer<PRE>#out))

DisplayList:
SaveLayer@0
  CompositorWheelHitTestTarget@0 target_scroll_frame_index=0 rect=[0,0 800x600]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[0,0 800x74.59375]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[8,8 784x53.59375]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[10,8 780x53.59375]
  Save@1
    AddClipRect@1 rect=[10,16 780x46]
    FillRect@1 rect=[10,8 780x54] color=rgb(0, 0, 255)
  Restore@1
  FillPath@1 path_bounding_rect=[789,16 1x46]
  FillPath@1 path_bounding_rect=[788,15 1x47]
  FillPath@1 path_bounding_rect=[10,61 780x1]
  FillPath@1 path_bounding_rect=[11,60 778x1]
  FillPath@1 path_bounding_rect=[10,16 1x46]
  FillPath@1 path_bounding_rect=[11,15 1x47]
  Save@1
    AddClipRect@1 rect=[10,16 14x2]
    FillPath@1 path_bounding_rect=[10,16 780x1]
    FillPath@1 path_bounding_rect=[9,17 782x1]
  Restore@1
  Save@1
    AddClipRect@1 rect=[81,16 709x2]
    FillPath@1 path_bounding_rect=[10,16 780x1]
    FillPath@1 path_bounding_rect=[9,17 782x1]
  Restore@1
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[24,8 57.328125x18]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[24,31.59375 752x18]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[24,31.59375 752x18]
  DrawGlyphRun@1 rect=[26,8 54x18] translation=[26,21.796875] color=rgb(0, 0, 0)
  DrawGlyphRun@1 rect=[24,31 63x18] translation=[24,45.390625] color=rgb(0, 0, 0)
Restore@0