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ids).On this page:
ids are unique within a page.id attributes use duplicate values within the same page;This ensures that content and functionality is presented in a way that works reliably across all supported browsers and assistive technologies.
4.1.1 Parsing: In content implemented using markup languages, elements have complete start and end tags, elements are nested according to their specifications, elements do not contain duplicate attributes, and any IDs are unique, except where the specifications allow these features. (Level A)
See the W3C’s detailed explanation of this guideline with techniques and examples.
role attributes are nested correctlyrole attribute, look at the role’s definition in the W3C ARIA 1.1 specifications to check whether you’re nesting elements with that role correctly.id attributes are unique on a Web page technique in the Web Content Accessible GuidelinesThis document is in beta. Help us by reporting issues via Github or email.