What is a key requirement for EPUB distribution?

A key requirement for EPUB distribution is the presence of an accessible interface for content location. This ensures that all users, including those with disabilities, can navigate the content effectively. EPUB, which stands for Electronic Publication, is designed to be versatile and user-friendly, allowing users to easily locate and interact with textual content, images, and other multimedia elements. An accessible interface is vital to promote inclusive reading experiences, particularly for individuals relying on assistive technologies.

The other options, while relevant in different contexts, do not represent the core requirement. For example, while high-quality graphics can enhance the user experience, they are not essential for EPUB distribution. Likewise, text-to-speech capabilities are valuable for certain audiences but are not a fundamental requirement of the EPUB format itself. Support for all operating systems may broaden the reach of the EPUB files but does not specifically address the accessibility of the interface for users navigating the content. Thus, emphasizing an accessible interface directly aligns with the commitment to ensuring that all users can benefit from digital publications without obstacles.