Titles and subtitles allow a clear and hierarchical organization of the content of each page of the book.

Objectives

• Make it easier for the reader to understand and navigate by presenting content in a structured and logical manner

Implementation

• Use HTML tags

  ,

  ,

  ,

  ,

  et

• Each page must have at least one

• Maintain a consistent hierarchy: a title of level

  must not be followed by a title of level

  .

Control

• Check the source code of the epub HTML page:
  • The titles and subtitles must be in an tag from 1 to 6.
  • There must be at least one

    .

  • The order of the title levels must be hierarchical and coherent.

  Validation

  • Reported by ACE.
  • Needs to be human verified.