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<div> element is using ARIA attributes, but its
role has not been defined. ARIA defines semantics that can be applied to elements, with these divided into roles (defining a type of user interface element) and states and properties that are supported by a role. Authors must assign an ARIA role and the appropriate states and properties to an element during its life-cycle, unless the element already has appropriate ARIA semantics (via use of an appropriate HTML element). Examples:
<!-- This div uses ARIA but its role is not clear, so it's invalid. --> <div aria-expanded="true">...</div> <!-- This div defines clearly its role, so it's valid. --> <div role="navigation" aria-expanded="true">...</div> <!-- Nav elements have an implicit navigation role so we don't need the role attribute. --> <nav aria-expanded="true">...</nav>
Read about Using ARIA: Roles, states and properties.