What should be avoided when defining ARIA roles in relation to elements?

Defining roles that are contrary to the default HTML semantics should be avoided because HTML elements already have inherent semantics that assist assistive technologies in understanding their purpose and function. When ARIA roles are applied in ways that contradict or override these existing semantics, it can create confusion for users relying on assistive technologies, such as screen readers. This misalignment may lead to misinterpretations of the content, ultimately hindering accessibility rather than enhancing it.

By keeping ARIA roles in alignment with the semantics of HTML elements, developers can provide a clearer and more predictable user experience for everyone, especially those with disabilities. This approach encourages the use of native HTML elements whenever possible, as they come with built-in accessibility features that ARIA roles cannot fully replicate or improve upon. By respecting the existing semantics, the web maintains a standardized and accessible environment for all users.