layer at (0,0) size 800x600
  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x79
  RenderBlock {HTML} at (0,0) size 800x79
    RenderBody {BODY} at (8,14) size 784x51
      RenderBlock {P} at (0,0) size 784x51
        RenderText {TEXT} at (0,0) size 748x51
          text run at (0,0) width 748: "Any textual selection in this long paragraph should have green background. Any textual selection in this long"
          text run at (0,17) width 722: "paragraph should have green background. Any textual selection in this long paragraph should have green"
          text run at (0,34) width 87: "background."
