Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x600 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x0 children: inline
      TextNode <#text>
  Box <dialog#modal> at (358.84375,291.5) content-size 82.3125x17 positioned flex-container(row) [FFC] children: not-inline
    BlockContainer <(anonymous)> (not painted) [BFC] children: inline
      TextNode <#text>
    BlockContainer <span> at (358.84375,291.5) content-size 82.3125x17 flex-item [BFC] children: inline
      frag 0 from TextNode start: 0, length: 10, rect: [358.84375,291.5 82.3125x17] baseline: 13.296875
          "I'm a node"
      TextNode <#text>
    BlockContainer <(anonymous)> (not painted) [BFC] children: inline
      TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x600]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x0]
  PaintableBox (Box<DIALOG>#modal) [339.84375,272.5 120.3125x55]
    PaintableWithLines (BlockContainer<SPAN>) [358.84375,291.5 82.3125x17]
      TextPaintable (TextNode<#text>)
