Viewport <#document> at [0,0] [0+0+0 800 0+0+0] [0+0+0 600 0+0+0] children: not-inline
  BlockContainer <html> at [0,0] [0+0+0 800 0+0+0] [0+0+0 108 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [8,8] [8+0+0 784 0+0+8] [8+0+0 50 0+0+8] children: not-inline
      BlockContainer <div#a> at [8,8] floating [0+0+0 100 0+0+0] [0+0+0 100 0+0+0] [BFC] children: not-inline
      Box <div#b> at [108,8] flex-container(row) [0+0+0 684 0+0+0] [0+0+0 50 0+0+0] [FFC] children: not-inline
      BlockContainer <(anonymous)> at [8,58] [0+0+0 784 0+0+0] [0+0+0 0 0+0+0] children: inline
        TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x108]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x50] overflow: [8,8 784x100]
      PaintableWithLines (BlockContainer<DIV>#a) [8,8 100x100]
      PaintableBox (Box<DIV>#b) [108,8 684x50]
      PaintableWithLines (BlockContainer(anonymous)) [8,58 784x0]

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x108] [children: 0] (z-index: auto)
