What is the role of the words "must" and "should" in WCAG techniques?

The words "must" and "should" in the context of WCAG (Web Content Accessibility Guidelines) techniques carry specific meanings that define their role in providing guidance. "Must" indicates a requirement that is essential for compliance with the guidelines, emphasizing that if the requirement is not met, then accessibility goals will not be achieved. In contrast, "should" suggests recommendations or best practices that enhance accessibility but allow for some flexibility in implementation. This distinction helps developers and content creators understand which aspects of accessibility are mandatory and which are encouraged for better user experiences.

While options that mention determining strict requirements or indicating what is optional may touch on some aspects of WCAG language, they do not encapsulate the broader clarification and guidance provided by "should." By using these terms, WCAG ensures that there is a clear understanding of priorities in accessibility techniques, which assists designers and developers in implementing effective solutions. Consequently, recognizing the role of these terms is crucial for applying the guidelines correctly and effectively.