Glossary
Searchable terminology from accessibility, web standards, and related fields.
87 results found in standards.
- Luminance (Relative Luminance)
- The relative brightness of a color as perceived by the human eye, measured on a scale from 0 (black) to 1 (white). In accessibility, relative luminance is the foundation of WCAG color contrast ratio c…
- MIDI (Musical Instrument Digital Interface)
- A technical standard for communication between electronic musical instruments, computers, and related audio devices. MIDI transmits digital messages representing musical events like note-on, note-off,…
- MathML (Mathematical Markup Language)
- A W3C standard XML-based markup language for describing mathematical notation and its structure, enabling mathematical content to be rendered visually in web browsers and read aloud by screen readers.…
- Matterhorn Protocol (PDF Association Matterhorn Protocol)
- A comprehensive set of test conditions published by the PDF Association for verifying PDF/UA (ISO 14289-1) conformance. The Matterhorn Protocol categorizes accessibility checks into those that can be …
- Metadata
- Data that provides structured information about other data or digital content. In accessibility, metadata plays a critical role in describing the accessibility features and characteristics of digital …
- Mobile Web Accessibility (Mobile Accessibility)
- The practice of ensuring websites and web applications are usable by people with disabilities when accessed through mobile devices such as smartphones and tablets. Mobile web accessibility presents un…
- Mobile Web Best Practices (MWBP, MWBP 1.0)
- A W3C recommendation published in 2006 that defines good usability and accessibility practices for delivering web content to mobile devices. Derived from the Web Content Accessibility Guidelines 1.0 (…
- MusicXML
- An open, XML-based standard format for representing Western musical notation, enabling the exchange of sheet music between different music notation software applications. MusicXML encodes the structur…
- NCAM (National Center for Accessible Media)
- A research and development facility at WGBH (Boston public media) that develops accessible media technologies and guidelines. NCAM created widely-adopted guidelines for describing STEM images (charts,…
- National Transition Strategy (NTS) (NTS, Web Accessibility National Transition Strategy)
- The Australian Government's National Transition Strategy was a formal policy established in June 2010 requiring all federal, state, and territory government websites to conform to WCAG 2.0. It set sta…
- Nemeth Code (Nemeth Braille Code for Mathematics and Science)
- A specialized braille code developed by Abraham Nemeth for representing mathematics, science notation, and technical symbols. Nemeth Code provides a comprehensive system for expressing equations, frac…
- OpenDocument Format (ODF, OASIS ODF)
- An open, XML-based file format standard for office documents maintained by OASIS (Organization for the Advancement of Structured Information Standards). ODF includes specifications for text documents,…
- OpenXR
- An open, royalty-free standard developed by the Khronos Group that provides a unified API for accessing VR and AR platforms and devices. OpenXR lets XR applications run across different headsets (Meta…
- PDF Accessibility (Accessible PDF, PDF A11y)
- The practice of creating PDF documents that can be effectively used by people with disabilities, including those who use screen readers, keyboard navigation, magnification, or other assistive technolo…
- PDF/UA (ISO 14289, Universal Accessibility for PDF)
- The international standard (ISO 14289) for accessible PDF documents. PDF/UA defines requirements for PDF content, PDF readers, and assistive technology to ensure accessible interaction with PDF docume…
- POUR
- The four foundational principles of WCAG: Perceivable (information must be presentable to users in ways they can perceive), Operable (user interface components must be operable), Understandable (infor…
- POUR Principles (POUR, Four Principles of Accessibility)
- The four foundational principles of the Web Content Accessibility Guidelines (WCAG): Perceivable, Operable, Understandable, and Robust. Perceivable means information must be presentable in ways users …
- Personalization Semantics (WAI-Adapt)
- A W3C specification that defines standardized semantics enabling content to be adapted to individual user needs and preferences. Personalization Semantics allows web authors to add metadata attributes…
- SAE Automation Levels (SAE J3016, Levels of Driving Automation)
- A six-level classification system (0-5) defined by SAE International that describes the degree of vehicle automation. Level 0 provides no automation; Levels 1-2 offer driver assistance features; Level…
- SCORM (Sharable Content Object Reference Model)
- A set of technical standards for e-learning software products, originally developed by the Advanced Distributed Learning (ADL) initiative. SCORM defines how learning content is packaged, sequenced, an…