ARIA

What Is ARIA?

ARIA (Accessible Rich Internet Applications) is a technical specification developed by the W3C's Web Accessibility Initiative (WAI). It defines a set of attributes that can be added to HTML to improve how web content is interpreted by assistive technologies. This is especially important for users with disabilities who interact with custom user interface components, such as dropdowns, modals, or carousels. While native HTML elements offer some accessibility support by default, ARIA fills gaps where HTML falls short—such as describing dynamic content or custom interface behavior.

ARIA Roles, Properties, and States

ARIA is organized into three categories: roles, properties, and states.

ARIA Roles

ARIA roles describe the function of an element (e.g., "button," "dialog," "tab"). They tell screen readers how to describe an element to the user. For example, applying role="tab" to a button lets assistive technology present that button as part of a tab interface.

ARIA Properties

ARIA properties provide extra context. Unlike roles, which define purpose, properties explain characteristics that don't change. For example, aria-label="Search" on a button containing only an icon gives screen reader users the needed description.

ARIA States

ARIA states indicate dynamic conditions, such as open/closed or pressed/not pressed. For instance, aria-expanded="true" signals that an accordion section is currently open. These values help users understand how interactive components are behaving in real time.

Common Use Cases

ARIA is commonly used for custom widgets like sliders and toolbars, dynamic updates to page content (e.g., live regions), and components that change state (e.g., modals, accordions). ARIA enables developers to make these experiences more accessible when HTML alone can't provide the needed cues.

Best Practices for ARIA

Use native HTML elements whenever possible. They have built-in accessibility and behavior support. Only apply ARIA roles, properties, and states when necessary. Misuse can reduce accessibility. Reference the ARIA Authoring Practices Guide for implementation patterns and tested usage strategies.

Why ARIA Matters

Without ARIA, assistive technologies may not understand how to navigate or interpret non-standard UI elements. Proper use of ARIA enables more equitable digital experiences by making content and interactions accessible to those relying on screen readers or other assistive tools.