Rule: Values must be valid

Rule ID	Widget 4
Conformance	Required
Definition	ARIA property and state values must be valid types.
Purpose	ARIA attributes must be a valid type to accurately describe web content to users of assistive technologies, especially screen reader users.
Conformance	Required
WCAG Success Criteria	Success Criterion 4.1.2 Name, Role, Value Other Related Success Criterion: Success Criterion 1.3.1 Info and Relationships Success Criterion 3.3.2 Labels or Instructions
Rule Category	ARIA Widgets
Rule Scope	Element
Techniques	Use valid values for ARIA attributes. Check W3C WAI Accessible Rich Internet Applications specification for allowed values for ARIA attributes.
Information Links	Accessible Rich Internet Applications (WAI-ARIA) 1.2 Specification: Supported Property and States G108: Using markup features to expose the name and role, allow user-settable properties to be directly set, and provide notification of changes ARIA5: Using WAI-ARIA state and property attributes to expose the state of a user interface component ARIA Authoring Practices MDN Web Docs: ARIA Web Fundamentals: Introduction to ARIA