What are the “H” pages in the e-book?

In earlier versions of our e-books, digital-only pages were labeled with “H” page numbers.

This approach was replaced with lettered page designations (such as 25a, 25b, and 25c) because many users found the H-page system confusing.

Related:

• How do I navigate the e-book in my course?
• What are the e-book pages labeled with letters, such as 25a, 25b, or 25c?
• Why does the page number sometimes stay the same in my e-book while I continue scrolling?