layer at (0,0) size 800x600
  RenderCanvas at (0,0) size 800x600
layer at (0,0) size 800x68
  RenderBlock {HTML} at (0,0) size 800x68
    RenderBody {BODY} at (8,16) size 784x36
      RenderBlock {P} at (0,0) size 784x36
        RenderText {TEXT} at (0,0) size 754x36
          text run at (0,0) width 754: "Any textual selection in this long paragraph should have green background. Any textual selection in this long paragraph"
          text run at (0,18) width 678: "should have green background. Any textual selection in this long paragraph should have green background."
