AccumulatedVisualContext Tree:
  [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 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=[8,8 105.671875x22]
  FillRect@1 rect=[8,8 106x22] color=rgb(212, 208, 200)
  FillPath@1 path_bounding_rect=[8,8 106x22]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[13,10 95.671875x18]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[13,10 95.671875x18]
  DrawGlyphRun@1 rect=[13,10 96x18] translation=[13,23.796875] color=rgb(0, 0, 0)
  DrawLine@1 from=[13,27] to=[109,27] color=rgb(0, 0, 0) thickness=2
Restore@0