According to the World Wide Web Consortium, digitally accessible content should follow the POUR model. POUR is defined as:
Perceivable - Web content is made available to the senses: sight, hearing, and/or touch.
Operable - Interface forms, controls, and navigation are operable.
Understandable - Information and the operation of user interface must be understandable.
Robust - Content can be used reliably by a wide variety of user agents, including assistive technologies.