Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x216 [BFC] children: inline
    frag 0 from Box start: 0, length: 0, rect: [8,8 200x200] baseline: 21.796875
    Box <body> at (8,8) content-size 200x200 flex-container(row) [FFC] children: not-inline
      BlockContainer <div> at (8,8) content-size 200x200 flex-item [BFC] children: inline
        frag 0 from TextNode start: 0, length: 5, rect: [8,8 36.84375x18] baseline: 13.796875
            "hello"
        TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x216]
    PaintableBox (Box<BODY>) [8,8 200x200]
      PaintableWithLines (BlockContainer<DIV>) [8,8 200x200]
        TextPaintable (TextNode<#text>)
