Content tagging

The process of adding structural markup to document content that identifies the role and meaning of each element. In PDF accessibility, content tagging involves marking regions of a document as paragraphs, headings, lists, tables, figures, or artifacts so that assistive technologies can interpret and present the content correctly. Tagged content enables screen readers to distinguish between a main heading and body text, identify table relationships, and skip decorative elements. Content tagging is a fundamental requirement of the PDF/UA standard and is essential for documents to be accessible to people with visual impairments.