The Web Content Accessibility Guidelines (WCAG) 2.0 principle Perceivable is met when information and user components are available to an individual by
Supplementing or replacing speech and handwriting (for example, by using facial expressions, symbols, pictures, gestures, and signing) can be achieved with
EN 301 549 (EU) and Section 508 of the Rehabilitation Act (U.S.) include accessibility procurement requirements for information technology purchased by