WCAG (Web Content Accessibility Guidelines) is the W3C standard that defines how to make digital content usable by people with disabilities, organized around being perceivable, operable, understandable, and robust, with conformance levels A, AA, and AAA. AA is the common legal and procurement benchmark.

For an OTT platform, WCAG shapes the apps and the player: keyboard and screen-reader navigation, sufficient contrast, caption styling and controls, and accessible UI states. It works alongside media-specific obligations (captions, audio description) that may be mandated by laws such as the ADA, the 21st Century Communications and Video Accessibility Act, or the European Accessibility Act - making accessibility a compliance requirement, not just good practice.