It supplements HTML so that interactions and widgets commonly used in applications can be passed to assistive technologies when there is not otherwise a mechanism. For example, ARIA enables accessible navigation landmarks in HTML4, JavaScript widgets, form hints and error messages, live content updates, and more. ARIA was invented after HTML4, so does not validate in HTML4 or its XHTML variants.
What ARIA attributes to use on HTML elements?
aria-label: aria-label is used to add a label with any input field or CTA that will be identified by screen reader devices. This is helpful when we have any such form field that doesn't have a label and we are using a placeholder to describe the field. e.g. aria-label="Submit the application form"
aria-describedby
aria-required
aria-invalid
aria-hidden
aria-expended: aria-expended attribute is used with accordion where we set expended value true or false. When an accordion is open to read then set aria-expended="true" attribute otherwise aria-expended="false".
Hope this ARIA article helps you to apply accessibility to your website and makes your site or portal accessible for all users.