layer at (0,0) size 800x600
  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x18
  RenderBlock {test} at (0,0) size 800x18 [color=#008000]
    RenderText {TEXT} at (0,0) size 136x18
      text run at (0,0) width 136: "This should be green."
