What is the main focus of standard tags in PDF or EPUB documents?

The main focus of standard tags in PDF or EPUB documents is to provide specific semantic meaning and proper structure. This facilitates accessibility by ensuring that assistive technologies, like screen readers, can interpret the document correctly. When tags are applied appropriately, they help define the roles and relationships of the content within the document, such as headings, paragraphs, lists, and images. This structured information allows users with disabilities to navigate the content more easily and understand the context and hierarchy of the information presented.

Proper tagging is essential for creating accessible documents because it enhances user experience by allowing for efficient navigation and logical reading order. Furthermore, standard tags help to ensure compliance with accessibility standards, making it easier to create documents that everyone can access, regardless of their abilities.