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  BlockContainer <html> at (1,1) content-size 798x334 [BFC] children: not-inline
    Box <body.hero> at (2,2) content-size 600x332 flex-container(column) [FFC] children: not-inline
      BlockContainer <div.header> at (102,3) content-size 400x330 flex-item [BFC] children: inline
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            "This entire"
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        TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x336]
    PaintableBox (Box<BODY>.hero) [1,1 602x334]
      PaintableWithLines (BlockContainer<DIV>.header) [101,2 402x332]
        TextPaintable (TextNode<#text>)
