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  BlockContainer <html> at (1,1) content-size 798x455 [BFC] children: not-inline
    Box <body.hero> at (10,10) content-size 500x437 flex-container(column) [FFC] children: not-inline
      BlockContainer <div.upper> at (10,11) content-size 500x435 flex-item [BFC] children: inline
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            "orange"
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            "background."
        TextNode <#text>
      BlockContainer <(anonymous)> (not painted) [BFC] children: inline
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ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x457]
    PaintableBox (Box<BODY>.hero) [9,9 502x439] overflow: [9,10 502x437]
      PaintableWithLines (BlockContainer<DIV>.upper) [9,10 502x437]
        TextPaintable (TextNode<#text>)
