[A11Y] Question from the Locators TF

Hi all,

The Locators TF is working on an interoperable method for generating page locators across reading systems and books. Just to give an idea of what we’re considering, we have developed a skeleton for an algorithm that could parse an EPUB file and generate “locators” at defined intervals.

One of the questions we are tackling now is where the locators live after generation. In practice, reading systems do not typically write to the EPUB file, meaning that if the locators are generated upon loading, they would potentially live in a “virtual” space accessible to the reading system. This virtual locator list would be usable by the reading system for things like search or navigate to page but would not appear in text or in the DOM.

This is the question we need help with. Our understanding is that locators need to be accessible to assistive technology, though the user may turn them on or off, which means we need to explore how locators need to be changed to accommodate this. Any advice you can provide on:

  *   the use cases of page numbers with AT,
  *   what use cases need to be supported,
  *   are there other ways page numbers/locators need to be exposed to the user or AT

Please let us know if there are any questions, or if this is best discussed on an upcoming call, our next one is April 29th at 10AM ET.

Thanks,
Wendy
Co-chair, EPUB3 WG