Glossary

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AChecker(also: IDI Web Accessibility Checker)

An open-source web accessibility evaluation tool that checks HTML content against accessibility standards including WCAG 2.0. AChecker identifies three types of issues: known problems (definite violations detectable by rule), likely problems (probable violations requiring human…

Accessibility Linter(also: A11y Linter, Accessibility Lint)

A static analysis tool that scans source code — typically HTML, CSS, and related web technologies — for accessibility violations against standards such as WCAG. Accessibility linters can be integrated into code editors, build pipelines, or run as standalone tools to flag issues…

Accessibility Overlay(also: A11y Overlay, Accessibility Widget, Accessibility Plugin)

A third-party software product that applies a layer of JavaScript over a website claiming to automatically fix accessibility issues, typically through a toolbar widget offering features like text resizing, color contrast adjustment, and screen reader optimization. Despite…

ArUco Marker(also: ArUco Fiducial)

A square fiducial marker composed of a black border and an inner binary pattern that encodes a unique ID, designed for fast, robust pose estimation from a single camera image. ArUco markers are widely supported by OpenCV and are used in augmented reality, robotics, and research…

Authoring Tool(also: Web Authoring Tool, Content Authoring Tool)

An authoring tool is any software application used to create or modify web content, ranging from code editors and content management systems (CMS) to visual page builders and social media platforms. The W3C's Authoring Tool Accessibility Guidelines (ATAG) address two aspects of…

Automated Accessibility Testing(also: Automated Testing, Accessibility Scanning, A11y Testing)

The use of software tools to programmatically check web content against accessibility guidelines such as WCAG, identifying issues like missing alternative text, insufficient color contrast, empty links, and missing form labels. While automated tools such as WAVE, axe, and…

Automated Evaluation Tool(also: AET, Automated Testing Tool, Accessibility Checker)

Software that automatically scans websites, applications, or documents to detect accessibility violations against standards such as WCAG or Section 508. Common examples include WAVE, axe, AChecker, and Lighthouse. While these tools can efficiently identify many technical…

Axe(also: axe-core, Deque Axe)

An open-source accessibility testing engine developed by Deque Systems that checks web content against WCAG and other accessibility standards. Axe can be integrated into browsers (via browser extensions), development workflows (via axe-core library), and testing frameworks (via…

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