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ARIA (accessible rich internet applications) is a set of attributes that can make interactive web content more accessible to people with disabilities. It can explicitly create semantic associations between different HTML elements, and can provide information to assistive technologies without exposing that same information to most users. It can help you do things like:
What ARIA does not do is expand upon the default functionality of a given HTML element. ARIA was published before the HTML5 specification, and many of the early uses of ARIA, especially the role attribute, are now largely redundant with the expanded set of semantic HTML 5 elements. Many people new to ARIA assume that, because ARIA is associated with accessibility, that more ARIA is always better. This is incorrect.
By design, EOU websites don’t have many of the complex interactive elements that would benefit from using ARIA attributes. If your website has interactive elements with multiple states like image sliders, pop ups, dynamically updating content, and accordions, the WAI-ARIA Authoring Practices provides a repository of well-implemented patterns to use.