Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x33 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x17 children: not-inline
      Box <div.flex> at (8,8) content-size 784x17 flex-container(row) [FFC] children: not-inline
        Box <div.grid> at (8,8) content-size 67.4375x17 flex-item [GFC] children: not-inline
          BlockContainer <div.w-fit> at (8,8) content-size 31.25x17 [BFC] children: inline
            frag 0 from TextNode start: 0, length: 4, rect: [8,8 31.25x17] baseline: 13.296875
                "Col1"
            TextNode <#text>
          BlockContainer <div.w-fit> at (41.71875,8) content-size 33.71875x17 [BFC] children: inline
            frag 0 from TextNode start: 0, length: 4, rect: [41.71875,8 33.71875x17] baseline: 13.296875
                "Col2"
            TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x33]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x17]
      PaintableBox (Box<DIV>.flex) [8,8 784x17]
        PaintableBox (Box<DIV>.grid) [8,8 67.4375x17]
          PaintableWithLines (BlockContainer<DIV>.w-fit) [8,8 31.25x17]
            TextPaintable (TextNode<#text>)
          PaintableWithLines (BlockContainer<DIV>.w-fit) [41.71875,8 33.71875x17]
            TextPaintable (TextNode<#text>)
