anchor.diff:          ul
             li #[code a] &amp; #[code a[href]] #[small.o-Textbox.c-Label.c-Label--info Transparent Content Model #[sup: a.Rf(rel="this" href="#fn-a")#rf-a 15]]
             li #[code span]
  -          li #[code br] #[small.o-Textbox.c-Label.c-Label--info Empty Content Model #[sup: a.Rf(rel="this" href="#fn-br")#rf-br 13]]
  -          li #[code wbr] #[small.o-Textbox.c-Label.c-Label--info Empty Content Model #[sup: a.Rf(rel="this" href="#fn-wbr")#rf-wbr 14]]
  +          li #[code br] #[small.o-Textbox.c-Label.c-Label--info Nothing Content Model #[sup: a.Rf(rel="this" href="#fn-br")#rf-br 13]]
  +          li #[code wbr] #[small.o-Textbox.c-Label.c-Label--info Nothing Content Model #[sup: a.Rf(rel="this" href="#fn-wbr")#rf-wbr 14]]
           section
             h3 Stressed Text
             ul
  
positive.code:             li #[code table]
              li #[code caption]
              li #[code colgroup]
              li #[code col] #[small.o-Textbox.c-Label.c-Label--info Empty Content Model #[sup: a.Rf(rel="this" href="#fn-col")#rf-col 11]]
              li #[code tbody]
              li #[code thead]
              li #[code tfoot]
  
negative.code:               a.Fn(rel="this" href="#rf-col")#fn-col 11
                a.Fn(rel="this" href="#rf-br")#fn-br 13
                a.Fn(rel="this" href="#rf-wbr")#fn-wbr 14
                a.Fn(rel="this" href="#rf-img")#fn-img 25
                a.Fn(rel="this" href="#rf-input")#fn-input 26
              | An element with an #[dfn Nothing Content Model] may contain no children. 
              small.
                Most elements with a Nothing Content Model are also #[dfn void elements], which
                have a start tag but no end tag.
            li
              sup
                a.Fn(rel="this" href="#rf-section")#fn-section 2
  