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    Box 
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      BlockContainer  at (102,3) content-size 400x327.5 flex-item [BFC] children: inline
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        TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
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    PaintableBox (Box.hero) [1,1 602x331.5]
      PaintableWithLines (BlockContainer.header) [101,2 402x329.5]
        TextPaintable (TextNode<#text>)