Four Principals of IT Accessibility
Four principals of IT accessibility
The WCAG also include a list of checkpoints-the first step in compliance verification. According to the WCAG, four principals form the foundation of IT accessibility:
Principal No. 1: Perceivable
User interfaces and any information contained within them must be easily viewable. There also should be alternative ways to read text and access video content (that is, closed captioning). All content must be distinguishable.
Principal No. 2: Operable
Users must be able to navigate Websites and applications via a keyboard and a mouse, and they should be provided with tools or assistive technology shortcuts to determine basic navigation. Developers cannot enforce time limits on Websites and applications unless there are reasonable security concerns that justify such constraints.
Principal No. 3: Understandable
Text should be readable and understandable, Web pages should be predictable and users should have access to input assistance that allows them to correct mistakes.
Principal No. 4: Robust
Content cannot conflict with assistive technologies and it must be robust enough that those technologies can reliably interpret it. For accessibility purposes, all content must provide role names and descriptions and use well-formed markup language.