Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (1,1) content-size 798x18 [BFC] children: not-inline
BlockContainer <body> at (10,10) content-size 780x0 children: not-inline
Box <nav> at (11,11) content-size 310.453125x19 positioned flex-container(row) [FFC] children: not-inline
BlockContainer <div.item> at (12,12) content-size 308.453125x17 flex-item [BFC] children: inline
frag 0 from TextNode start: 0, length: 36, rect: [12,12 308.453125x17] baseline: 13.296875
"This should have a green background."
TextNode <#text>
ViewportPaintable (Viewport<#document>) [0,0 800x600]
PaintableWithLines (BlockContainer<HTML>) [0,0 800x20] overflow: [1,1 798x30]
PaintableWithLines (BlockContainer<BODY>) [9,9 782x2] overflow: [10,10 312.453125x21]
PaintableBox (Box<NAV>) [10,10 312.453125x21]
PaintableWithLines (BlockContainer<DIV>.item) [11,11 310.453125x19]
TextPaintable (TextNode<#text>)