Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x34 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x18 children: not-inline
      Box <div.flex> at (8,8) content-size 784x18 flex-container(row) [FFC] children: not-inline
        Box <div.grid> at (8,8) content-size 67.4375x18 flex-item [GFC] children: not-inline
          BlockContainer <div.w-fit> at (8,8) content-size 31.25x18 [BFC] children: inline
            frag 0 from TextNode start: 0, length: 4, rect: [8,8 31.25x18] baseline: 13.796875
                "Col1"
            TextNode <#text>
          BlockContainer <div.w-fit> at (41.71875,8) content-size 33.71875x18 [BFC] children: inline
            frag 0 from TextNode start: 0, length: 4, rect: [41.71875,8 33.71875x18] baseline: 13.796875
                "Col2"
            TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  PaintableWithLines (BlockContainer<HTML>) [0,0 800x34]
    PaintableWithLines (BlockContainer<BODY>) [8,8 784x18]
      PaintableBox (Box<DIV>.flex) [8,8 784x18]
        PaintableBox (Box<DIV>.grid) [8,8 67.4375x18]
          PaintableWithLines (BlockContainer<DIV>.w-fit) [8,8 31.25x18]
            TextPaintable (TextNode<#text>)
          PaintableWithLines (BlockContainer<DIV>.w-fit) [41.71875,8 33.71875x18]
            TextPaintable (TextNode<#text>)
