Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer  at (1,1) content-size 798x42 [BFC] children: not-inline
    BlockContainer 
 at (10,10) content-size 780x24 children: not-inline
      BlockContainer  at (11,11) content-size 778x22 children: inline
        line 0 width: 22, height: 22, bottom: 22, baseline: 22
          frag 0 from Box start: 0, length: 0, rect: [22,22 0x0]
        Box  at (22,22) content-size 0x0 flex-container(row) [FFC] children: not-inline
          BlockContainer <(anonymous)> at (22,22) content-size 0x0 [BFC] children: inline
            TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer) [0,0 800x44]
    PaintableWithLines (BlockContainer) [9,9 782x26]
      PaintableWithLines (BlockContainer.first) [10,10 780x24]
        PaintableBox (Box.second) [11,11 22x22]
          PaintableWithLines (BlockContainer(anonymous)) [22,22 0x0]