anchor.diff:                while inline-level HTML elements are written in-line with text.
               li Line breaks may also be used within long passages of text content.
               li In CSS, 99% of the time, each rule is written on its own line.
  -            li Exception: line breaks may be omitted when multiple, parallel code structures can fit on one line.
  +          section
  +            h1 Exceptions
  +            ul
  +              li Line breaks may be omitted when multiple, parallel code structures can fit on one line.
  +              li Line breaks may be introduced to improve readability and produce more useful diffs.
  +              li Use spaces to horizontally align text in such cases.
           section
             h1 Indentation
             ul
  
positive.code:                 li variables use under_score_lower_case
                  li constants use UNDER_SCORE_UPPER_CASE
          section
            h1 Spaces and Punctuation
            ul
              li Always put spaces immediately inside block and inline comment delimiters.
              li Always omit spaces immediately inside HTML start or end tags.
              li Always include a slash, but not a space, for an HTML self-closing tag.
              li Always omit spaces immediately inside HTML attribute values.
              li Always put spaces immediatlely inside CSS and JS braces #[strong #[em only if] they are on the same line].
              li Always omit spaces immediatlely inside parentheses #[strong #[em even when] they are on the same line].
              li.
                In JS, put spaces before open parentheses and after control keywords, but not after names of functions
                (#[code if (...) { ... }], #[code function talk(...) { ... }]).
  
negative.code:           dt Version History
            dd
              time(datetime="2016-01-19 14:34") Jan 19, 2016 #[span.tod  2:34 PM]
            dd
              time(datetime="2016-01-20 16:11") Jan 20, 2016 #[span.tod  4:11 PM]
            dd(itemprop="dateModified")
              time(datetime="2016-01-22 17:48") Jan 22, 2016 #[span.tod  5:48 PM]
          p.
            #[strong General Principles.] As
            #[a(href="http://nicolasgallagher.com/") Nicolas Gallagher]
  