Viewport <#document> at (0,0) content-size 800x600 children: not-inline
  BlockContainer <html> at (0,0) content-size 800x1584 [BFC] children: not-inline
    BlockContainer <body> at (8,8) content-size 784x1568 children: not-inline
      ImageBox <img> at (8,8) content-size 784x1568 children: not-inline
        (SVG-as-image isolated context)
        Viewport <#document> at (0,0) content-size 0x0 children: inline
          SVGSVGBox <svg> at (0,0) content-size 0x0 [SVG] children: inline
            TextNode <#text>
            SVGGeometryBox <rect> at (0,0) content-size 0x0 children: not-inline
            TextNode <#text>
