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layer at (0,0) size 800x600
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        RenderBlock {DIV} at (0,0) size 784x18
          RenderText {#text} at (0,0) size 307x18
            text run at (0,0) width 307: "There should be a single empty H1 block below."
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          RenderBR {BR} at (0,0) size 0x37
        RenderBlock {DIV} at (0,97) size 784x18
          RenderText {#text} at (0,0) size 306x18
            text run at (0,0) width 306: "There should be a single empty H1 block above."
caret: position 0 of child 0 {BR} of child 3 {H1} of child 0 {DIV} of child 0 {BODY} of child 0 {HTML} of document
