Why is alt text important in EPUB publications?

Alt text, or alternative text, is crucial in EPUB publications because it ensures that users, particularly those with visual impairments, have meaningful access to images. This text describes the content and function of images, enabling screen readers to convey this information to users who cannot see the images themselves. By providing this descriptive context, alt text contributes to a more inclusive and accessible reading experience, allowing users to fully understand and engage with the content.

While other aspects of document creation may be important, they do not specifically address the fundamental role that alt text plays in accessibility. Visual appeal and formatting might enhance the aesthetic of a document but do not enhance understanding for users who rely on assistive technologies. Additionally, access modes for images refer specifically to how content is conveyed, which is exactly the purpose of alt text—making it essential for creating an inclusive digital publication.