anchor.diff:        section
           h2 Embedded Content
           ul
  -          li #[code img] #[small.o-Textbox.c-Label.c-Label--info Nothing Content Model #[sup: +reference('img-nothing-content-model')]]
  +          li #[code img] #[+tag('Nothing Content Model','img-nothing-content-model')]
         section
           h2 Forms
           ul
  -          li #[code input] #[small.o-Textbox.c-Label.c-Label--info Nothing Content Model #[sup: +reference('input-nothing-content-model')]]
  +          li #[code input] #[+tag('Nothing Content Model','input-nothing-content-model')]
         section
           h2 Interactive Content
         footer
  
positive.code:         p May be used where Flow Content is expected.
          ul
            li #[code html]
            li #[code body]    #[small.o-Textbox.c-Label.c-Label--info Sectioning Root    #[sup: +reference('body-sectioning-root')]]
            li #[code section] #[small.o-Textbox.c-Label.c-Label--info Sectioning Content #[sup: +reference('section-sectioning-content')]]
            li #[code article] #[small.o-Textbox.c-Label.c-Label--info Sectioning Content #[sup: +reference('article-sectioning-content')]]
            li #[code aside]   #[small.o-Textbox.c-Label.c-Label--info Sectioning Content #[sup: +reference('aside-sectioning-content')]]
            li #[code nav]     #[small.o-Textbox.c-Label.c-Label--info Sectioning Content #[sup: +reference('nav-sectioning-content')]]
            li #[code main]
            li #[code header]
            li #[code footer]
            li #[code h1]&ndash;#[code h6] #[small.o-Textbox.c-Label.c-Label--info Phrasing Content Model #[sup: +reference('hn-phrasing-content-model')]]
            li #[code address] #[sup: +reference('address')]
        section
          h2 Grouping Content
          p May be used where Flow Content is expected.
          ul
            li #[code hr] #[small.o-Textbox.c-Label.c-Label--info Nothing Content Model #[sup: +reference('hr-nothing-content-model')]]
            li #[code div]
          section
            h3 Paragraph-Like Content
            ul
              li #[code p] #[small.o-Textbox.c-Label.c-Label--info Phrasing Content Model #[sup: +reference('p-phrasing-content-model')]]
              li #[code figure] #[small.o-Textbox.c-Label.c-Label--info Sectioning Root #[sup: +reference('figure-sectioning-root')]]
              li #[code figcaption]
              li #[code blockquote] #[small.o-Textbox.c-Label.c-Label--info Sectioning Root #[sup: +reference('blockquote-sectioning-root')]]
              li #[code pre] #[small.o-Textbox.c-Label.c-Label--info Phrasing Content Model #[sup: +reference('pre-phrasing-content-model')]]
          section
            h3 Lists
            ul
  
negative.code:             li #[code table]
              li #[code caption]
              li #[code colgroup]
              li #[code col] #[+tag('Nothing Content Model','col-nothing-content-model')]
              li #[code tbody]
              li #[code thead]
              li #[code tfoot]
              li #[code tr]
              li #[code th] #[sup: +reference('th')]
              li #[code td] #[+tag('Sectioning Root','td-sectioning-root')]
        section
          h2 Text-Level Semantics
          p.
            May be used where Phrasing Content is expected.
            All elements in this section have the Phrasing Content Model unless otherwise specified.
          ul
            li #[code a] &amp; #[code a[href]] #[+tag('Transparent Content Model','a-transparent-content-model')]
            li #[code span]
            li #[code br] #[+tag('Nothing Content Model','br-nothing-content-model')]
            li #[code wbr] #[+tag('Nothing Content Model','wbr-nothing-content-model')]
          section
            h3 Stressed Text
            ul
  