Tests:
Test 1
No role is allowed on the body, html or head elements.
To manually verify, check this page with a conformance checker. The html element has a role=document, and the head and body elements have role=presentation.
To verify additional roles, use the text field below to enter valid roles and dynamically apply them to the body, html and head elements, and then re-run the conformance checkers.
Warning: adding certain ARIA roles to the body and html elements may make this page inaccessible.
Expectation: conformance checkers will indicate that role=document is redundant on html element, and that a role with any other value is invalid on the html element.
Conformance checkers will indicate that any role is invalid on the body and head elements.