AccumulatedVisualContext Tree:
  [1] scroll_frame_id=1 (PaintableWithLines(BlockContainer<PRE>#out))
    [2] transform=[0.70710677,-0.70710677,0.70710677,0.70710677,0,0] origin=(108,108) (PaintableWithLines(BlockContainer(anonymous)))
      [3] transform=[0.5,0,0,0.5,0,0] origin=(58,58) (PaintableWithLines(BlockContainer<DIV>.inner))

DisplayList:
SaveLayer@0
  CompositorWheelHitTestTarget@0 target_scroll_frame_index=0 rect=[0,0 800x600]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[0,0 800x221]
  CompositorWheelHitTestTarget@1 target_scroll_frame_index=0 rect=[8,8 784x200]
  CompositorWheelHitTestTarget@2 target_scroll_frame_index=0 rect=[8,8 200x200]
  FillRect@2 rect=[8,8 200x200] color=rgb(173, 216, 230)
  CompositorWheelHitTestTarget@3 target_scroll_frame_index=0 rect=[8,8 100x100]
  FillRect@3 rect=[8,8 100x100] color=rgb(255, 127, 80)
  DrawGlyphRun@3 rect=[8,8 52x18] translation=[8,21.796875] color=rgb(0, 0, 0)
Restore@0