This rule determines whether attributes
id and their value are defined more than once, as they should be unique.
id is not unique and is assigned to several elements, automation will fail because only the first element will be selected. Assistive technologies are also impacted by duplicate IDs since they frequently obtain data associated with the first
id. Even if other WAI-ARIA attributes are correct, assistive technologies are unlikely to provide accurate information after the duplicate
id is presented.
How to fix it
- Ensure all attributes
idhave a unique value.
Accessibility, WCAG 2.1, Success Criterion 4.1.1 (Parsing), Level A