Viewport <#document> at [0,0] [0+0+0 800 0+0+0] [0+0+0 600 0+0+0] [BFC] children: not-inline
  BlockContainer <html> at [0,0] [0+0+0 800 0+0+0] [0+0+0 36 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [8,8] [8+0+0 784 0+0+8] [8+0+0 20 0+0+8] children: inline
      frag 0 from BlockContainer start: 0, length: 0, rect: [8,12 300x12] baseline: 12
      BlockContainer <progress#a> at [8,12] inline-block [0+0+0 300 0+0+0] [0+0+0 12 0+0+0] [BFC] children: not-inline
        BlockContainer <div> at [9,13] [0+1+0 298 0+1+0] [0+1+0 12 0+1+0] children: not-inline
          BlockContainer <div> at [9,13] [0+0+0 298 0+0+0] [0+0+0 12 0+0+0] children: not-inline
      TextNode <#text> (not painted)
      TextNode <#text> (not painted)

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x36]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x20]
      PaintableWithLines (BlockContainer<PROGRESS>#a) [8,12 300x12]
        PaintableWithLines (BlockContainer<DIV>) [8,12 300x14]
          PaintableWithLines (BlockContainer<DIV>) [9,13 298x12]

SC for Viewport<#document> [0,0 800x600] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x36] (z-index: auto)
