Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (1,1) content-size 798x39.46875 [BFC] children: not-inline
    Box <body> at (10,10) content-size 780x21.46875 flex-container(row) [FFC] children: not-inline
      BlockContainer <div.upper> at (11,11) content-size 41.78125x19.46875 flex-item [BFC] children: not-inline
        TableWrapper <(anonymous)> at (11,11) content-size 41.78125x19.46875 [BFC] children: not-inline
          Box <(anonymous)> at (11,11) content-size 41.78125x19.46875 table-box [TFC] children: not-inline
            Box <(anonymous)> at (11,11) content-size 41.78125x19.46875 table-row children: not-inline
              BlockContainer <div.cell> at (12,12) content-size 39.78125x17.46875 table-cell [BFC] children: inline
                line 0 width: 39.78125, height: 17.46875, bottom: 17.46875, baseline: 13.53125
                  frag 0 from TextNode start: 0, length: 5, rect: [12,12 39.78125x17.46875]
                    "Hello"
                TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x41.46875]
    PaintableBox (Box<BODY>) [9,9 782x23.46875]
      PaintableWithLines (BlockContainer<DIV>.upper) [10,10 43.78125x21.46875]
        PaintableWithLines (TableWrapper(anonymous)) [11,11 41.78125x19.46875]
          PaintableBox (Box(anonymous)) [11,11 41.78125x19.46875]
            PaintableBox (Box(anonymous)) [11,11 41.78125x19.46875]
              PaintableWithLines (BlockContainer<DIV>.cell) [11,11 41.78125x19.46875]
                TextPaintable (TextNode<#text>)
