layer at (0,0) size 800x600
  LayoutView at (0,0) size 800x600
layer at (0,0) size 800x600
  LayoutBlockFlow {HTML} at (0,0) size 800x600
    LayoutBlockFlow {BODY} at (0,0) size 800x600
      LayoutBlockFlow {DETAILS} at (0,0) size 800x18
        LayoutBlockFlow {SUMMARY} at (0,0) size 800x18
          LayoutDetailsMarker {DIV} at (0,3) size 10.55x10.55: down
          LayoutText {#text} at (16,0) size 73x17
            text run at (16,0) width 73: "summary 1"
        LayoutBlockFlow {DIV} at (0,18) size 800x0
caret: position 0 of child 0 {DIV} of {#document-fragment} of child 1 {SUMMARY} of child 1 {DETAILS} of body