Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- ARIA(also: Accessible Rich Internet Applications, WAI-ARIA)
- A W3C specification that provides a framework of roles, states, and properties to make dynamic web content and custom user interface controls accessible to assistive technologies. ARIA supplements HTML semantics where native elements are insufficient. The first rule of ARIA is:…
- Adaptive content(also: Content adaptation, Adaptive hypermedia)
- Content that automatically adjusts its presentation, structure, or level of detail based on the needs, preferences, or capabilities of the user or their device. In accessibility, adaptive content goes beyond responsive design (which adjusts layout) to potentially restructure…
- Alt text(also: Alternative text, Text alternative)
- A textual description of non-text content (primarily images) provided via the HTML alt attribute, read by screen readers and displayed when images cannot be loaded. Required by WCAG Success Criterion 1.1.1 (Level A), alt text should convey the same information or function as the…
- Audio description(also: AD, Described video, Video description)
- Narration added to a media soundtrack that describes important visual information — such as actions, characters, scene changes, and on-screen text — that cannot be understood from the main audio alone. Audio description makes video and live performance content accessible to…
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