AccumulatedVisualContext Tree:
  [1] scroll_frame_id=0 (PaintableWithLines(BlockContainer<PRE>#out))

DisplayList:
SaveLayer@0
  FillRect@1 rect=[8,8 29x30] color=rgb(0, 0, 0)
  FillRect@1 rect=[38,8 28x30] color=rgb(0, 0, 0)
  FillRect@1 rect=[67,8 29x30] color=rgb(0, 0, 0)
  FillRect@1 rect=[97,8 28x30] color=rgb(0, 0, 0)
  FillRect@1 rect=[126,8 29x30] color=rgb(0, 0, 0)
Restore@0