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layer at (0,0) size 800x600
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      RenderBlock (anonymous) at (0,0) size 784x20
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          text run at (0,0) width 259: "These lines should have the same width:"
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        RenderText {#text} at (0,0) size 72x19
          text run at (0,0) width 72: ". . . . . . . . a"
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          text run at (0,20) width 72: ". . . . . . . . a\x{300}"
