Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x600 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x0 children: not-inline
      Box <div.display_flex> at (8,8) content-size 23.609375x18 floating flex-container(row) [FFC] children: not-inline
        BlockContainer <div> at (8,8) content-size 23.609375x18 flex-item [BFC] children: not-inline
          BlockContainer <div> at (8,8) content-size 23.609375x18 floating [BFC] children: not-inline
            BlockContainer <span> at (8,8) content-size 14.265625x18 floating [BFC] children: inline
              frag 0 from TextNode start: 0, length: 1, rect: [8,8 14.265625x18] baseline: 13.796875
                  "A"
              TextNode <#text>
            BlockContainer <span> at (22.265625,8) content-size 9.34375x18 floating [BFC] children: inline
              frag 0 from TextNode start: 0, length: 1, rect: [22.265625,8 9.34375x18] baseline: 13.796875
                  "B"
              TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x0] overflow: [8,8 23.609375x18]
      PaintableBox (Box<DIV>.display_flex) [8,8 23.609375x18]
        PaintableWithLines (BlockContainer<DIV>) [8,8 23.609375x18]
          PaintableWithLines (BlockContainer<DIV>) [8,8 23.609375x18]
            PaintableWithLines (BlockContainer<SPAN>) [8,8 14.265625x18]
              TextPaintable (TextNode<#text>)
            PaintableWithLines (BlockContainer<SPAN>) [22.265625,8 9.34375x18]
              TextPaintable (TextNode<#text>)
