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  BlockContainer <html> at (1,1) content-size 798x331.5 [BFC] children: not-inline
    Box <body.hero> at (2,2) content-size 600x329.5 flex-container(column) [FFC] children: not-inline
      BlockContainer <div.header> at (102,3) content-size 400x327.5 flex-item [BFC] children: inline
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          frag 0 from TextNode start: 0, length: 11, rect: [102,3 340.484375x65.5]
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        TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x333.5]
    PaintableBox (Box<BODY>.hero) [1,1 602x331.5]
      PaintableWithLines (BlockContainer<DIV>.header) [101,2 402x329.5]
        TextPaintable (TextNode<#text>)
