Viewport <#document> at (0,0) content-size 800x600 children: inline
  InlineNode <svg>
    TextNode <#text>
    InlineNode <rect>
    TextNode <#text>

ViewportPaintable (Viewport<#document>) [0,0 800x600]
  InlinePaintable (InlineNode<svg>)
    InlinePaintable (InlineNode<rect>)