Glossary

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UAAG(also: User Agent Accessibility Guidelines)

A set of guidelines from the W3C Web Accessibility Initiative that explains how to make user agents — browsers, media players, and other applications that render web content — accessible to people with disabilities. UAAG addresses how user agents should support assistive…

UI Agent(also: User Interface Agent, Browser Agent, AI Agent)

An AI-powered software system that can autonomously interact with graphical user interfaces on behalf of a user, performing tasks by interpreting natural language commands and translating them into interface actions such as clicking buttons, entering text, and navigating between…

Upper Ontology(also: Foundation Ontology, Top-level Ontology)

An upper ontology is a high-level, domain-independent ontology that describes very general concepts — such as 'object', 'role', 'event', 'time', or, in a web-accessibility context, generic structural roles like 'menu', 'navigation', 'content region', or 'decoration'. It is…

Usable Accessibility

Usable accessibility is the principle that meeting technical accessibility standards (such as WCAG compliance) is necessary but not sufficient for ensuring that people with disabilities can effectively use digital products. A website may be technically accessible — screen…

User Agent(also: Browser, Web Browser)

In web accessibility, a user agent is any software that retrieves, renders, and facilitates user interaction with web content. This includes mainstream web browsers like Chrome, Firefox, and Safari, as well as assistive technologies such as screen readers that work alongside…

User-Generated Content(also: UGC, Prosumer Content)

Web content created and published by non-technical users through platforms like blogs, social media, wikis, and content management systems, rather than by professional web developers. The rise of user-generated content in Web 2.0 has created a significant accessibility…

User-Generated Content Accessibility(also: UGC Accessibility)

The practice of ensuring that user-generated content such as online reviews, forum posts, comments, and social media contributions is accessible to people with disabilities. Unlike curated website content, user-generated content poses unique accessibility challenges because it…

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