anchor.diff:  ----
   <section class="chapter">
     <!-- h1 used for all chapter titles -->
  -  <h1>Chapter Title</h1>
  +  <h1 class="title">Chapter Title</h1>
     <!-- Lots of chapter content here -->
   </section>
   ----
  
positive.code: ----
  <section class="titlepage">
    <!-- h1 used for book title -->
    <h1>Book Title</h1>
    <!-- Whatever else goes on the title page: publishername, logo, etc. -->
  </section>
  ----
  
negative.code: ----
  <section class="bibliography">
    <!-- optional h1 used for all bibliography titles -->
    <h1 class="title">Bibliography Title</h1>
    <p class="biblioentry"><!-- Biblioentry content --></p>
    <!-- More biblioentries below -->
  </section>
  