anchor.diff:          dt: a(href="html-entities.html") Chart of Commonly Used Unicode Characters
           dd: p.
             description
  -        dt: a(href="html-notes.html") html-notes.html
  -        dd: p.
  -          description
  +        //- dt: a(href="html-notes.html") html-notes.html
  +        //- dd: p.
  +        //-   description
           dt: a(href="layout.html") layout.html
           dd: p.
             description
  -        dt: a(href="Lists.html") Lists.html
  +        dt: a(href="lists.html") lists.html
           dd: p.
             description
           dt: a(href="math-changing-world.html") math-changing-world.html
  
positive.code:     link(rel="stylesheet" href="https://cdn.rawgit.com/chharvey/still-alive/v1.0.0/still-alive.css")
      style.
        dt {
          //- display: list-item;
          //- list-style-type: disc;
        }
        dd {
          display: none;
  
negative.code:         dt: a(href="math-moodle.html") math-moodle.html
          dd: p.
            description
          //- dt: a(href="Object-Oriented-CSS.html") Object-Oriented-CSS.html
          //- dd: p.
          //-   description
          dt: a(href="page-relationships.html") page-relationships.html
          dd: p.
            description
          dt: a(href="references-edu.html") references-edu.html
  