AccumulatedVisualContext Tree:
  [0] transform=[1,0,0,1,0,0] origin=(0,0) (ViewportPaintable(Viewport<#document>))
    [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 800x70.59375]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[8,8 784x49.59375]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[10,8 780x49.59375]
  Save@1
    AddClipRect@1 rect=[10,15 780x43]
    FillRect@1 rect=[10,8 780x50] color=rgb(0, 0, 255)
  Restore@1
  FillPath@1 path_bounding_rect=[789,15 1x43]
  FillPath@1 path_bounding_rect=[788,14 1x44]
  FillPath@1 path_bounding_rect=[10,57 780x1]
  FillPath@1 path_bounding_rect=[11,56 778x1]
  FillPath@1 path_bounding_rect=[10,15 1x43]
  FillPath@1 path_bounding_rect=[11,14 1x44]
  Save@1
    AddClipRect@1 rect=[10,15 14x2]
    FillPath@1 path_bounding_rect=[10,15 780x1]
    FillPath@1 path_bounding_rect=[9,16 782x1]
  Restore@1
  Save@1
    AddClipRect@1 rect=[81,15 709x2]
    FillPath@1 path_bounding_rect=[10,15 780x1]
    FillPath@1 path_bounding_rect=[9,16 782x1]
  Restore@1
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[24,8 57.328125x16]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[24,29.59375 752x16]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[24,29.59375 752x16]
  DrawGlyphRun@1 rect=[26,8 54x16] translation=[26,20.796875] color=rgb(0, 0, 0)
  DrawGlyphRun@1 rect=[24,29 63x16] translation=[24,42.390625] color=rgb(0, 0, 0)
Restore@0