layer at (0,0) size 808x584
  RenderView at (0,0) size 800x584
layer at (0,0) size 800x584
  RenderBlock {HTML} at (0,0) size 800x584
    RenderBody {BODY} at (8,8) size 784x568
      RenderBlock {P} at (0,0) size 784x21 [color=#008000]
        RenderText {#text} at (0,0) size 397x21
          text run at (0,0) width 397: "This text should be green if viewport is wider than 30em."
      RenderBlock {DIV} at (0,37) size 480x21 [bgcolor=#ADD8E6]
        RenderText {#text} at (0,0) size 134x21
          text run at (0,0) width 134: "div of length 30 em"
      RenderBlock {DIV} at (0,58) size 800x21 [bgcolor=#ADD8E6]
        RenderText {#text} at (0,0) size 134x21
          text run at (0,0) width 134: "div of length 800px"