AEM Core components should have common and generic features, including accessibility. It appears that ARIA Attributes are not implemented in AEM Core Components
Teaser Component Looking at AEM's teaser component documentation, which showcases screenshots from author, the only accessibility field Adobe have is for the "alt" property.
When I look at Adobe example output (the Markup tabs under each section) and look at the sections with anchor links, I do not see any ARIA attributes either.
My Conclusion I think that AEM put in the ARIA support for the button as a way to resolve common accessibility issues with HTML buttons, but Adobe has no broader solution for accessibility.
I am requesting Adobe to add properties required for Accessibility to the AEM Core Components
Use-case:
Accessibility
Current/Experienced Behavior:
No capability to add ARIA
Improved/Expected Behavior:
Able to author ARIA label
Environment Details (AEM version/service pack, any other specifics if applicable):