layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x51
  RenderBlock {test} at (0,0) size 800x51
    RenderBlock {p} at (0,16) size 800x19
      RenderBlock {input} at (2,3) size 12x12 [bgcolor=#00FF00]
      RenderText {#text} at (16,1) size 4x17
        text run at (16,1) width 4: " "
      RenderInline {span} at (0,0) size 388x17 [bgcolor=#00FF00]
        RenderText {#text} at (20,1) size 388x17
          text run at (20,1) width 388: "Everything in this paragraph should have a green background"