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  BlockContainer <html> at (1,1) content-size 798x0 [BFC] children: not-inline
    BlockContainer <body> at (10,10) content-size 93.59375x19.46875 positioned [BFC] children: not-inline
      BlockContainer <nav> at (11,11) content-size 91.59375x17.46875 children: inline
        line 0 width: 91.59375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
          frag 0 from TextNode start: 0, length: 10, rect: [11,11 91.59375x17.46875]
            "border box"
        TextNode <#text>
