layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (8,8) size 784x584
      RenderText {#text} at (0,0) size 0x0
layer at (8,8) size 375x118
  RenderInline {SPAN} at (0,0) size 375x118 [bgcolor=#808080]
    RenderText {#text} at (75,23) size 300x26
      text run at (75,23) width 300: "This content should be masked"
    RenderBR {BR} at (374,44) size 1x0
    RenderText {#text} at (0,95) size 161x26
      text run at (0,95) width 161: "with a soft glow."