During editing, we view each page of an epub ebook through a browser. When we're satisfied that styles are correct and the content displays as it should, we create a final epub ebook.
Every epub ebook is validated to ensure that all the content—text and graphics—is present in the epub files and that essential metadata elements are expressed correctly. We use epubcheck, an open-source tool that verifies the completeness and consistency of the content.
When an epub file passes all the checks, the last test is to view the document on an e-reader. All these steps are necessary, and a rigorous testing process ensures the client receives a high-quality document optimised for usability.