layer at (0,0) size 800x600
  RenderView at (0,0) size 800x600
layer at (0,0) size 800x600
  RenderBlock {HTML} at (0,0) size 800x600
    RenderBody {BODY} at (0,0) size 800x600
      RenderBlock {DETAILS} at (0,0) size 800x17
        RenderBlock {SUMMARY} at (0,0) size 800x17
          RenderDetailsMarker {DIV} at (0,4) size 11x11: right
          RenderText {#text} at (16,0) size 45x17
            text run at (16,0) width 45: "Details"
caret: position 0 of child 0 {DIV} of {#document-fragment} of child 0 {SUMMARY} of child 0 {WEBKITSHADOWCONTENT} of {#document-fragment} of child 1 {DETAILS} of body