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  LayoutView at (0,0) size 800x600
layer at (0,0) size 800x600
  LayoutBlockFlow {HTML} at (0,0) size 800x600
    LayoutBlockFlow {BODY} at (8,8) size 784x584
      LayoutText {#text} at (0,0) size 0x0
layer at (8,8) size 119x371 transparent
  LayoutInline {SPAN} at (0,0) size 119x371 [bgcolor=#808080]
    LayoutText {#text} at (22,75) size 27x296
      text run at (22,75) width 296: "This content should be masked"
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    LayoutText {#text} at (94,0) size 27x158
      text run at (94,0) width 158: "with a soft glow."