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 39 0+0+0] [BFC] children: not-inline
    BlockContainer <body> at [8,8] [8+0+0 784 0+0+8] [8+0+0 23 0+0+8] children: inline
      frag 0 from BlockContainer start: 0, length: 0, rect: [8,13 300x12] baseline: 12
      BlockContainer <progress#a> at [8,13] inline-block [0+0+0 300 0+0+0] [0+0+0 12 0+0+0] [BFC] children: not-inline
        BlockContainer <div> at [9,14] [0+1+0 298 0+1+0] [0+1+0 12 0+1+0] children: not-inline
          BlockContainer <div> at [9,14] [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 800x39]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x23]
      PaintableWithLines (BlockContainer<PROGRESS>#a) [8,13 300x12] overflow: [8,13 300x14]
        PaintableWithLines (BlockContainer<DIV>) [8,13 300x14]
          PaintableWithLines (BlockContainer<DIV>) [9,14 298x12]

SC for Viewport<#document> [0,0 800x600] [children: 1] (z-index: auto)
 SC for BlockContainer<HTML> [0,0 800x39] [children: 0] (z-index: auto)
