anchor.diff:                The #[code footer] element should contain secondary information, data about
                 #[em the content in the section], such as copyright information, contact information,
                 related links or references, and footnotes.
  -            footer: p: small Neither element may contain any #[code header] or #[code footer] descendants.
  -          li #[code h1]&ndash;#[code h6] #[+tag('Phrasing Content Model','hn-phrasing-content-model')]
  +          li.
  +            #[code h1]&ndash;#[code h6]
  +            #[+tag('Phrasing Content Model','hn-phrasing-content-model')]
  +            #[+tag('Heading Content','hn-heading-content')]
             li #[code address] #[sup: +reference('address')]
  +        footer.c-Document__Draft
  +          p There are certain rules regarding the allowed nesting of certain sectioning elements:
  +          ul
  +            li.
  +              The #[code main] element #[em may not] be a descendant of any #[b Sectioning Content]
  +              elements.#[sup: +reference('main-caveat')]
  +              The #[code main] element also #[em may not] be a descendant of any
  +              #[code header] or #[code footer] element.
  +            li.
  +              Any #[code header] or #[code footer] element (in addition to prohibiting any
  +              #[code main] element descendants) #[em may not] contain any other
  +              #[code header] or #[code footer] elements, #[em unless] those said elements are
  +              descendants of a Sectioning Content element, which, in turn, is a descendant of
  +              the original #[code header] or #[code footer].
  +            li.
  +              The #[code address] element #[em may not] contain #[b Sectioning Content],
  +              #[b Heading Content], #[code header]s, or #[code footer]s.
         section#grouping-content
           h2 Grouping Content
           p May be used where Flow Content is expected.
  
positive.code:           dd.update: time(datetime="2015-03-08 14:57") Mar 8, 2015 #[span.tod  2:57 PM]
            dd.update: time(datetime="2016-02-14 01:15") Feb 14, 2016 #[span.tod  1:15 AM]
            dd.update: time(datetime="2016-03-06 15:41") Mar  6, 2016 #[span.tod  3:42 PM]
            dd.update
              time(datetime="2016-03-24 13:38" itemprop="dateModified") Mar 24, 2016 #[span.tod  1:38 PM]
              span.o-Textbox.c-Label.c-Label--dang.-ml-1 Latest
          nav#table-contents
            h2 Table of Contents
  
negative.code:             sup
                +footnote('summary')
              | The #[code summary] element may contain either Phrasing Content, or exactly 1 Heading Element (#[code h1]&ndash;#[code h6])
            li
              sup
                +footnote('main-caveat')
              | There is one exception: the #[code main] element may be a descendant of #[code section],
              |  however I prefer to restrict this use anyway. In fact, I adhere to the belief that
              |  there should be exactly 1 #[code main] element per document, and that it should be
              |  a direct child of #[code body].
      script(src="https://code.jquery.com/jquery-2.2.4.min.js" integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous")
      script(src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML,https://chharvey.github.io/chhlib/mathjax-localconfig.js")
  