Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Accessibility Crawler(also: automated accessibility crawler, app crawler for accessibility)
- An automated tool that systematically explores an application's user interface—by simulating taps, swipes, and navigation—to discover screens and UI components and then evaluate each against accessibility rules without human involvement. On Android, crawlers typically drive the…
- Auto-label(also: Automatic Labeling, Heuristic Labeling)
- A feature in authoring tools or runtime environments that automatically generates accessible labels for interactive elements when a developer has not explicitly provided one. For example, Adobe Flash Player's auto-label function would heuristically find nearby text for objects…
- Automatic Caption Evaluation(also: ACE, ACE Framework, ACE Metric)
- A caption-quality evaluation framework introduced by Sushant Kafle and Matt Huenerfauth (2017-2018) that scores automatically generated captions based on their usability for Deaf and Hard-of-Hearing readers, rather than simply counting transcription errors. For each mismatch…
- Document Layout Analysis(also: DLA, page layout analysis)
- A computer-vision task that identifies and classifies the visual regions of a document page—headings, paragraphs, tables, figures, captions, lists, headers, and footers—typically using object-detection models trained on datasets such as DocLayNet, PubLayNet, or DocBank. Document…
- Pa11y
- An open-source automated accessibility testing tool that runs from the command line and in continuous-integration pipelines. Pa11y can drive either axe-core or HTML CodeSniffer as its underlying rule engine, returning JSON-formatted results classified by severity (critical,…
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