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Each HTML identifier is used only once per Content Document

On the page of a book, some items can be identified by an identifier. It must be unique within this page.

Objectives

  • Avoid display issues
  • Ensure access to the identified element

Implementation

  • Assign unique identifiers to each element in the HTML page code by ensuring that no identifier is reused to this page.

Control

  • Check the source code of the HTML page of epub : No HTML identifier must be used more than once. Or EpubCheck

Validation

  • Reported by epubcheck.
  • Needs to be verified by a human.

Information