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))
      [2] clip=[9,9 104x30] (PaintableWithLines(BlockContainer<DIV>))

DisplayList:
SaveLayer@0
  CompositorWheelHitTestTarget@0 target_scroll_frame_index=0 rect=[0,0 800x600]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[0,0 800x53]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[8,8 784x32]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[8,8 784x32]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[8,8 106x32]
  FillRect@1 rect=[8,8 106x32] color=rgb(255, 255, 255)
  FillPath@1 path_bounding_rect=[8,8 106x32]
  CompositorWheelHitTestTarget@2 target_scroll_frame_index=0 rect=[11,11 100x13]
  CompositorWheelHitTestTarget@2 target_scroll_frame_index=0 rect=[11,11 100x13]
  DrawGlyphRun@2 rect=[11,11 30x13] translation=[11,21.390625] color=rgb(0, 0, 0)
  FillRect@2 rect=[11,11 1x13] color=rgb(0, 0, 0)
  FillPath@1 path_bounding_rect=[6,6 110x36]
  DrawLine@1 from=[109,37] to=[111,35] color=rgba(255, 255, 255, 0.392) thickness=1
  DrawLine@1 from=[108,37] to=[111,34] color=rgba(0, 0, 0, 0.392) thickness=1
  DrawLine@1 from=[106,37] to=[111,32] color=rgba(255, 255, 255, 0.392) thickness=1
  DrawLine@1 from=[105,37] to=[111,31] color=rgba(0, 0, 0, 0.392) thickness=1
  DrawLine@1 from=[103,37] to=[111,29] color=rgba(255, 255, 255, 0.392) thickness=1
  DrawLine@1 from=[102,37] to=[111,28] color=rgba(0, 0, 0, 0.392) thickness=1
Restore@0