anchor.diff:              li #[code mark] &mdash; relevance in a certain context
               li #[code u] &mdash; annotations
               li #[code small] &mdash; side comments
  -            li #[code s] &mdash; inaccurate text #[small.o-Textbox.c-Label.c-Label--info Transparent Content Model #[sup: +reference('s-transparent-content-model')]]
  +            li #[code s] &mdash; inaccurate text #[+tag('Transparent Content Model','s-transparent-content-model')]
           section
             h3 Documentation and Edits
             ul
  -            li #[code ins] #[small.o-Textbox.c-Label.c-Label--info Transparent Content Model #[sup: +reference('ins-transparent-content-model')]]
  -            li #[code del] #[small.o-Textbox.c-Label.c-Label--info Transparent Content Model #[sup: +reference('del-transparent-content-model')]]
  +            li #[code ins] #[+tag('Transparent Content Model','ins-transparent-content-model')]
  +            li #[code del] #[+tag('Transparent Content Model','del-transparent-content-model')]
               li #[code dfn]
               li #[code b] &mdash; keyword
               li #[code var]
  
positive.code:       a.Rf(id='rf-'+id href='#fn-'+id)= refs.indexOf(id)+1
      mixin footnote(id)
        a.Fn(id='fn-'+id href='#rf-'+id)= refs.indexOf(id)+1
      main.o-GoldenContainer__Content.c-Document(data-status="draft" itemscope="" itemtype="https://schema.org/Article")
        header
          h1(itemprop="name headline") Notes on HTML Elements
  
negative.code:         p May be used where Flow Content is expected.
          ul
            li #[code html]
            li #[code body]    #[+tag('Sectioning Root','body-sectioning-root')]
            li #[code section] #[+tag('Sectioning Content','section-sectioning-content')]
            li #[code article] #[+tag('Sectioning Content','article-sectioning-content')]
            li #[code aside]   #[+tag('Sectioning Content','aside-sectioning-content')]
            li #[code nav]     #[+tag('Sectioning Content','nav-sectioning-content')]
            li #[code main]
            li #[code header]
            li #[code footer]
            li #[code h1]&ndash;#[code h6] #[+tag('Phrasing Content Model','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] #[+tag('Nothing Content Model','hr-nothing-content-model')]
            li #[code div]
          section
            h3 Paragraph-Like Content
            ul
              li #[code p] #[+tag('Phrasing Content Model','p-phrasing-content-model')]
              li #[code figure] #[+tag('Sectioning Root','figure-sectioning-root')]
              li #[code figcaption]
              li #[code blockquote] #[+tag('Sectioning Root','blockquote-sectioning-root')]
              li #[code pre] #[+tag('Phrasing Content Model','pre-phrasing-content-model')]
          section
            h3 Lists
            ul
  