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 800x90]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[0,0 800x80]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[0,0 800x80]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[100,50 50x10]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[0,3 9.84375x14]
  FillPath@1 path_bounding_rect=[0,3 10x14]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[98,48 4x4]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[-2,63 9.921875x14]
  FillPath@1 path_bounding_rect=[-2,63 10x14]
  DrawGlyphRun@1 rect=[2,5 6x10] translation=[2,13] color=rgb(0, 0, 0)
  DrawGlyphRun@1 rect=[100,55 7x10] translation=[100,63] color=rgb(0, 0, 0)
  DrawGlyphRun@1 rect=[0,65 6x10] translation=[0,73] color=rgb(0, 0, 0)
Restore@0