Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (1,1) content-size 798x600 [BFC] children: not-inline
    BlockContainer <body> at (10,10) content-size 780x12 children: not-inline
      BlockContainer <(anonymous)> at (10,10) content-size 780x0 children: inline
        TextNode <#text>
      Box <div.flex-container> at (11,11) content-size 600x10 flex-container(row) [FFC] children: not-inline
        BlockContainer <(anonymous)> (not painted) [BFC] children: inline
          TextNode <#text>
        BlockContainer <div.flex-item> at (12,72) content-size 27.15625x18 flex-item [BFC] children: inline
          frag 0 from TextNode start: 0, length: 3, rect: [12,72 27.15625x18] baseline: 13.796875
              "foo"
          TextNode <#text>
        BlockContainer <(anonymous)> (not painted) [BFC] children: inline
          TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600] overflow: [0,0 800x602]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x602]
    PaintableWithLines (BlockContainer<BODY>) [9,9 782x14] overflow: [10,10 780x201]
      PaintableWithLines (BlockContainer(anonymous)) [10,10 780x0]
      PaintableBox (Box<DIV>.flex-container) [10,10 602x12] overflow: [11,11 600x200]
        PaintableWithLines (BlockContainer<DIV>.flex-item) [11,11 29.15625x200]
          TextPaintable (TextNode<#text>)
