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+0 466 0+0+0] [BFC] children: not-inline
    Box <body> at [8,8] [8+0+0 500 0+0+292] [8+0+0 450 0+0+8] [GFC] children: not-inline
      BlockContainer <div.a> at [8,183] [0+0+0 500 0+0+0] [50+0+125 0 0+0+0] [BFC] children: not-inline
      BlockContainer <div.b> at [8,183] [0+0+0 500 0+0+0] [0+0+0 0 175+0+100] [BFC] children: not-inline
      BlockContainer <(anonymous)> (not painted) [BFC] children: inline
        TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x466]
    PaintableBox (Box<BODY>) [8,8 500x450]
      PaintableWithLines (BlockContainer<DIV>.a) [8,58 500x125]
      PaintableWithLines (BlockContainer<DIV>.b) [8,183 500x175]

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x466] [children: 0] (z-index: auto)
