anchor.diff:  
   ==== Canvas
   
  -
   *HTML element*: <canvas>
   
  -*Note*: Should include a fallback link.
  +*Note*: Should include a fallback link to the audio online.
   
   *Examples*:
   
  
positive.code: 
  ==== Index Term
  
  
  *HTML element*: <a>
  
  *Special semantics*: class="indexterm"; data-primary="primary entry"; data-secondary="secondary entry"; data-tertiary="tertiary entry"; data-see="see term"; data-seealso="see also term"; data-sortas="alphabetization term"footnote:[From DocBook; no close match in EPUB 3 Structural Semantics Vocabulary]
  
  *Note*: Use of HTML5 data-* attributes seemed best fit for nonrendererd indexterm data, but would like to discuss this further.
  
  *Example*:
  
  
negative.code: 
  *HTML element*: <a>
  
  *Attribute requirements*: class="xref"footnote:[From DocBook]; an href attribute that should point to the id of a
  local HTMLBook resource referenced
  
  Example:
  
  