The web accessibility principles are what the Web Content Accessibility Guidelines (WCAG) are based on. Created by the World Wide Web Consortium (W3C), WCAG is considered by many to be the most important set of guidelines impacting global web accessibility policy. Websites and web content that conform to these guidelines are generally considered accessible to people with disabilities. The current version of the Web Content Accessibility Guidelines (WCAG), WCAG 2.1, is organized around four guiding principles: Perceivable, operable, understandable, and robust.
Here’s what each principle means: