Rocket Validator looks for accesibility violations on your pages using the axe-core accessibility engine, hosted on our own servers and integrated into our web crawler. You don't need to buy an additional license, everything's already included in your Pro account at Rocket Validator.
A11Y check: Elements must only use allowed ARIA attributes
Accessibility rule: Not all ARIA role-attribute combinations are valid. This Rule checks that each role is supplied with allowed attributes.