AccumulatedVisualContext Tree:
  [1] scroll_frame_id=1 (PaintableWithLines(BlockContainer<PRE>#out))
    [2] clip=[9,9 100x20] (PaintableWithLines(BlockContainer<DIV>))
      [3] clip=[11,10 96x18]

DisplayList:
SaveLayer@0
  CompositorWheelHitTestTarget@0 target_scroll_frame_index=0 rect=[0,0 800x600]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[0,0 800x43]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[8,8 784x22]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[8,8 784x22]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[8,8 102x22]
  FillRect@1 rect=[8,8 102x22] color=rgb(255, 255, 255)
  FillPath@1 path_bounding_rect=[8,8 102x22]
  CompositorWheelHitTestTarget@2 target_scroll_frame_index=0 rect=[9,9 100x20]
  CompositorWheelHitTestTarget@2 target_scroll_frame_index=0 rect=[11,10 96x18]
  DrawGlyphRun@3 rect=[11,10 37x18] translation=[11,23.796875] color=rgb(0, 0, 0)
  FillRect@3 rect=[11,10 1x18] color=rgb(0, 0, 0)
  FillPath@1 path_bounding_rect=[6,6 106x26]
Restore@0