AccumulatedVisualContext Tree:
  [0] transform=[1,0,0,1,0,0] origin=(0,0) (ViewportPaintable(Viewport<#document>))
    [1] scroll (PaintableWithLines(BlockContainer<PRE>#out))

DisplayList:
SaveLayer@0
  CompositorWheelHitTestTarget@0 target_scroll_node_index=0 rect=[0,0 800x600]
  CompositorWheelHitTestTarget@1 target_scroll_node_index=0 rect=[0,0 800x171]
  CompositorWheelHitTestTarget@1 target_scroll_node_index=0 rect=[8,8 784x150]
  CompositorWheelHitTestTargetWithCornerRadii@1 target_scroll_node_index=0 rect=[8,8 200x150] corner_radii=[40x40,10x10,40x40,10x10]
  FillPath@1 path_bounding_rect=[192,10 17x137]
  FillPath@1 path_bounding_rect=[182,22 12x115]
  FillPath@1 path_bounding_rect=[10,142 187x17]
  FillPath@1 path_bounding_rect=[22,132 165x13]
  FillPath@1 path_bounding_rect=[7,19 17x137]
  FillPath@1 path_bounding_rect=[22,29 12x115]
  FillPath@1 path_bounding_rect=[19,8 187x16]
  FillPath@1 path_bounding_rect=[29,22 165x12]
Restore@0

