Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x16 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x0 children: not-inline
      BlockContainer <div.hello> at (8,8) content-size 784x0 children: not-inline
        BlockContainer <(anonymous)> at (8,8) content-size 500x100 positioned [BFC] children: inline
          TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x16]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
      PaintableWithLines (BlockContainer<DIV>.hello) [8,8 784x0]
        PaintableWithLines (BlockContainer(anonymous)) [8,8 500x100]
