Glossary
Searchable terminology from accessibility, web standards, and related fields.
212 results found in Web Accessibility.
- ACT Rules (Accessibility Conformance Testing Rules, ACT-R)
- A set of standardized, machine-readable test rules developed by the W3C that provide specific, objective criteria for evaluating whether web content meets accessibility requirements like WCAG success …
- ARIA Hidden (aria-hidden Attribute)
- An WAI-ARIA attribute (aria-hidden="true") that removes an element and its descendants from the accessibility tree, making them invisible to screen readers and other assistive technologies while poten…
- ARIA Live Region (Live Region, aria-live)
- A section of a web page marked with the aria-live attribute that is dynamically updated and should be announced by assistive technologies when changes occur, even if the user's focus is elsewhere. Liv…
- ARIA Live Region (Live Region, ARIA Live)
- An ARIA live region is a section of a web page marked with the aria-live attribute that announces dynamic content changes to assistive technologies without requiring user focus to move to the updated …
- ATK (Accessibility Toolkit, Linux Accessibility Toolkit, AT-SPI)
- ATK (Accessibility Toolkit) is the accessibility framework for the Linux desktop environment, providing an API through which applications expose their user interface elements to assistive technologies…
- Access Keys (Accesskeys, Keyboard Shortcuts)
- Access keys are keyboard shortcuts defined in HTML using the accesskey attribute that allow users to activate or focus on specific elements — such as links or form controls — by pressing a key combina…
- Accessibility Annotation (A-Annotation, Accessibility Metadata)
- External metadata added to a web page to describe its visual layout structure, content groupings, and element roles for the purpose of improving accessibility without modifying the original page. Acce…
- Accessibility Barrier (A11y Barrier)
- Any aspect of a digital product, web page, document, or service that prevents or impedes a person with a disability from perceiving, operating, understanding, or using it on an equivalent basis to som…
- Accessibility Baseline (Baseline, Technology Baseline, WCAG Baseline)
- An accessibility baseline, as used in WCAG 2.0 and later versions, is the set of technologies that a content author assumes are supported and enabled in the user agents (browsers and assistive technol…
- Accessibility Commons (AC Repository, AC Metadata Repository)
- A shared metadata repository and schema proposed in 2008 by IBM, the University of Washington, Stony Brook University, and the University of Manchester to let accessibility-remediation research projec…
- Accessibility Conformance Level (WCAG Conformance Level, Conformance Level)
- Accessibility conformance levels are the tiered ratings defined by the Web Content Accessibility Guidelines (WCAG) to indicate the degree to which web content meets accessibility success criteria. WCA…
- Accessibility Conformance Testing (ACT, ACT Rules Format)
- A W3C technical recommendation that defines a standardized format for writing rules to test web accessibility. The ACT Rules Format provides a consistent structure for describing what to test and what…
- Accessibility Evaluation Method (AEM, Accessibility Testing Method)
- A structured approach or procedure used to assess the accessibility of digital products, websites, or applications. Accessibility evaluation methods include conformance review (checking against standa…
- Accessibility Gap (Usability Gap, Digital Divide)
- The measurable disparity in task performance, user experience, or access between people with disabilities and people without disabilities when using digital technology. The accessibility gap is common…
- Accessibility Metadata (A11y Metadata, Accessibility Annotations)
- Structured information that describes the accessibility features, hazards, or access modes of digital content. Accessibility metadata can be embedded within content (such as alt text in HTML) or store…
- Accessibility Monitoring (Web Accessibility Monitoring, Accessibility Observatory)
- Accessibility monitoring is the ongoing process of tracking and measuring the accessibility level of websites or digital products over time. Because web content is frequently updated, changes can inad…
- Accessibility Object Model (AOM)
- The Accessibility Object Model (AOM) is a proposed W3C web standard that aims to give JavaScript developers direct programmatic access to the browser's accessibility tree. While WAI-ARIA allows author…
- Accessibility Progress Formula (APPF, Accessibility Progress Percentage)
- A formula for quantitatively tracking progress in addressing accessibility issues on a website, expressed as APPF = A / ((A + B) + (T - C)), where A is the number of applicable checklist items that ha…
- Accessibility conformance (WCAG conformance, Accessibility compliance)
- The degree to which a digital product meets the requirements of an accessibility standard such as WCAG, typically assessed at Level A, AA, or AAA. While conformance provides a measurable baseline for …
- Accessibility maturity model (Organizational accessibility maturity)
- A framework for assessing how systematically an organization approaches digital accessibility, typically ranging from ad hoc or reactive practices to fully embedded, proactive processes. Maturity mode…