This is required to meet the Web Content Accessibility Guidelines (WCAG) 2.1 Level AA requirements which ensure web content is Perceivable, Operable, Understandable, and Robust (POUR) for users with disabilities. It includes all 2.0 A/AA standards plus 12 new criteria focused on mobile, low vision, and cognitive disabilities, such as Reflow, Text Spacing, and Non-text Contrast. Key requirements cover sufficient color contrast, keyboard navigation,, screen reader compatibility, and content adaptability.