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| layer at (0,0) size 800x600 |
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| RenderBody {BODY} at (0,0) size 800x600 |
| RenderBlock {DIV} at (0,0) size 800x20 |
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| text run at (0,0) width 470: "Three green 16x16 pixel squares should appear below, stacked vertically." |
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| RenderText {#text} at (0,0) size 0x0 |
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| RenderPartObject {IFRAME} at (0,0) size 18x18 [bgcolor=#FF0000] [border: (1px solid #000000)] |
| layer at (0,0) size 16x16 |
| RenderView at (0,0) size 16x16 |
| layer at (0,0) size 16x16 |
| RenderBlock {HTML} at (0,0) size 16x16 |
| RenderBody {BODY} at (0,0) size 16x16 |
| RenderImage {IMG} at (0,0) size 16x16 |
| RenderBR {BR} at (18,18) size 0x0 |
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| layer at (0,0) size 16x16 |
| RenderView at (0,0) size 16x16 |
| layer at (0,0) size 16x16 |
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| RenderBody {BODY} at (0,0) size 16x16 |
| RenderImage {IMG} at (0,0) size 16x16 |
| RenderText {#text} at (0,0) size 0x0 |
