This issue arises when an ARIA attribute has been added to a traditional HTML element (<a>, <ul>, etc.) where it is not allowed.

ARIA (Accessible Rich Internet Applications) attributes are specialized HTML attributes designed to enhance the accessibility of web applications, particularly for users relying on assistive technologies like screen readers. These attributes provide additional information about elements, roles, states, and properties that are not inherently conveyed by standard HTML.

ARIA specifies which ARIA role(s), states, and properties are allowed for each HTML tag. Detailed information about each attribute is available in the ARIA documentation for the respective roles and attributes.

Using ARIA attributes with roles that are not permitted can negatively impact a webpage's accessibility. An invalid role-attribute combination could possibly have no effect, but it could also disrupt accessibility across large parts of your content.

If ARIA attributes are applied to HTML elements in ways that do not align with WAI-ARIA 1.1 guidelines, they can conflict with the native semantics of those elements. This may cause assistive technologies to present confusing or inaccurate information about the user interface, misrepresenting the actual structure and functionality of the document.