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| LayoutView at (0,0) size 800x600 | |
| layer at (0,0) size 800x494 | |
| LayoutBlockFlow {HTML} at (0,0) size 800x494 | |
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| LayoutBlockFlow {P} at (0,0) size 784x18 | |
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| text run at (0,0) width 469: "The square below should be exactly 50% wide on the ruler at the bottom." | |
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