Which digital accessibility standard focuses primarily on making web content perceivable, operable, understandable, and robust?

The digital accessibility standard that focuses primarily on making web content perceivable, operable, understandable, and robust is the Web Content Accessibility Guidelines (WCAG). WCAG is an internationally recognized standard developed by the World Wide Web Consortium (W3C) to provide a single shared standard for web content accessibility. The guidelines are organized around four core principles, often referred to by the acronym POUR: Perceivable: Information and user interface components must be presentable to users in ways they can perceive. This includes providing text alternatives for non-text content, captions for videos, and ensuring sufficient contrast between text and background. Operable: User interface components and navigation must be operable. This includes making all functionality available from a keyboard, providing sufficient time for users to read and use content, and avoiding content that causes seizures. Understandable: Information and the operation of the user interface must be understandable. This includes making text readable and understandable, ensuring that content appears and operates in predictable ways, and helping users avoid and correct mistakes. Robust: Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies. This includes ensuring that code is valid and that content is compatible with current and future user agents. WCAG aims to make web content accessible to people with disabilities, including visual, auditory, physical, speech, cognitive, language, learning, and neurological disabilities.