ARIA attributes provide additional information about the semantics of elements to assistive technologies like screen readers. You may want to add ARIA attributes to any custom elements or applications on your site.
Important Note:
This feature is intended for users who have custom applications/elements that require ARIA attributes. If you do not have these on your site, you do not need to edit the ARIA attributes.
Adding ARIA Attributes
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Turn on Dev Mode
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Right-click on the relevant element
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Click Accessibility
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Click Add Attribute to get started
You can read more here
Enjoy! 
