Glossary

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W3C(also: World Wide Web Consortium)

The main international standards organisation for the World Wide Web, founded by Tim Berners-Lee in 1994. The W3C develops and maintains specifications including HTML, CSS, SVG, and ARIA. Its Web Accessibility Initiative (WAI) is responsible for the Web Content Accessibility…

W4A(also: International Cross-Disciplinary Conference on Web Accessibility, Web for All)

An annual research conference focused specifically on web accessibility, held in conjunction with the World Wide Web Conference (WWW/TheWebConf). W4A brings together researchers studying how to make the web accessible to people with disabilities, covering topics such as…

WAI(also: Web Accessibility Initiative)

A programme of the World Wide Web Consortium (W3C) that develops strategies, standards, and supporting resources to make the web accessible to people with disabilities. WAI is responsible for producing some of the most widely adopted accessibility standards, including the Web…

WAI-ARIA(also: ARIA, Accessible Rich Internet Applications)

A W3C technical specification that defines a set of HTML attributes (roles, states, and properties) for making dynamic web content and user interface components accessible to people using assistive technologies. WAI-ARIA bridges the gap between rich interactive web applications…

WAI-ARIA(also: ARIA, Accessible Rich Internet Applications, WAI-ARIA Specification)

A W3C technical specification that defines a set of HTML attributes (roles, states, and properties) to make dynamic web content and custom user interface widgets accessible to people using assistive technologies such as screen readers. ARIA allows developers to communicate the…

WAP(also: Wireless Application Protocol)

A suite of protocols and specifications designed to enable mobile devices to access internet content and services. WAP defined standards for how mobile devices communicate with web servers, including markup languages (WML, XHTML-MP) optimized for small screens and limited…

WAVE(also: WAVE Web Accessibility Evaluation Tool)

A suite of web accessibility evaluation tools developed by WebAIM (Web Accessibility In Mind) that identifies accessibility and WCAG errors in web pages. WAVE provides visual feedback by injecting icons and indicators directly into the page to show accessibility issues, making…

WCAG(also: Web Content Accessibility Guidelines, WCAG 1.0, WCAG 2.0)

A set of guidelines published by the W3C Web Accessibility Initiative (WAI) that define how to make web content more accessible to people with disabilities. WCAG is organized around four principles: Perceivable, Operable, Understandable, and Robust (POUR). The current version in…

WCAG 2.4 Navigable(also: Guideline 2.4, Navigable Guideline)

A guideline within the Web Content Accessibility Guidelines (WCAG) under the Operable principle that requires web content to provide ways to help users navigate, find content, and determine where they are. Its success criteria address bypass blocks (skip navigation links), page…

WCAG Compliance(also: WCAG Conformance, Web Accessibility Compliance)

The degree to which a website or web application meets the requirements specified in the Web Content Accessibility Guidelines (WCAG). WCAG defines three conformance levels (A, AA, AAA) with increasingly stringent criteria. Full WCAG compliance is rare — large-scale audits find…

WCAG Conformance(also: WCAG Compliance, Web Accessibility Conformance)

The degree to which a website or web application meets the requirements defined in the Web Content Accessibility Guidelines (WCAG). WCAG defines three conformance levels: Level A (minimum, addressing the most critical barriers), Level AA (the standard target for most regulations…

WCAG Conformance Levels(also: WCAG Levels, Level A, Level AA)

WCAG defines three levels of conformance that indicate the degree to which web content meets accessibility requirements. Level A is the minimum, addressing the most critical barriers that would completely prevent some users from accessing content. Level AA is the target for most…

WCAG-EM(also: Website Accessibility Conformance Evaluation Methodology)

A structured methodology published by the W3C for evaluating how well a website conforms to the Web Content Accessibility Guidelines (WCAG). WCAG-EM defines a five-step process: defining the evaluation scope, exploring the website, selecting a representative sample of pages,…

WEIRD(also: Western, Educated, Industrialized, Rich, and Democratic)

An acronym standing for Western, Educated, Industrialized, Rich, and Democratic — used to describe the demographic and cultural profile of populations that dominate research samples in psychology, HCI, and accessibility studies. The term highlights a significant bias: most…

WEIRD Bias(also: WEIRD Problem)

The overrepresentation of Western, Educated, Industrialized, Rich, and Democratic (WEIRD) populations in research, including HCI and accessibility studies. WEIRD bias means that findings, design guidelines, and technology solutions are predominantly shaped by and for a narrow…

WHODAS 2.0(also: WHODAS, WHO Disability Assessment Schedule, World Health Organization Disability Assessment Schedule 2.0)

WHODAS 2.0 is the World Health Organization Disability Assessment Schedule, version 2.0, a standardized instrument that measures health and disability across six life domains: cognition, mobility, self-care, getting along with others, life activities, and participation in…

WIMP(also: Windows Icons Menus Pointer)

An acronym for Windows, Icons, Menus, and Pointers — the dominant graphical user interface paradigm used by most desktop operating systems since the 1980s. WIMP interfaces rely on a pointing device (typically a mouse) to interact with visual elements on screen, including…

WURFL(also: Wireless Universal Resource File)

An open-source device description repository that catalogs the capabilities of mobile devices in a large XML file. WURFL collects information about device features such as screen size, image format support, CSS support, and pointing device availability, enabling developers and…

WYSIWYG(also: What You See Is What You Get)

An acronym for "What You See Is What You Get," describing a user interface paradigm where content displayed on screen during editing closely resembles the final output (such as a printed document). While WYSIWYG editors are standard in word processing, they can present…

Wake Word(also: Hotword, Trigger Word, Activation Word)

A specific word or phrase that activates a voice-controlled device, such as "Hey Google," "Alexa," or "Hey Siri." The wake word must be spoken before any command for the device to begin listening. Wake words present accessibility barriers for people with speech disfluencies, as…

Walk-up-and-use System(also: Walk-up-and-use Design, Zero Training Interface)

A design paradigm for public access systems where any user should be able to successfully complete tasks without prior training, instruction, or experience with the specific system. Walk-up-and-use systems must accommodate users with diverse abilities, technology experience, and…

Walkability(also: Walkability Index, Pedestrian Accessibility)

A measure of how conducive an area is to walking, considering factors such as the presence, quality, and connectivity of sidewalks, pedestrian crossings, street lighting, and proximity to destinations. Traditional walkability indices like Walk Score focus on distance to…

Walkability Index(also: Walk Score, Walkability Score, Pedestrian Accessibility Index)

A numerical metric that quantifies how walkable a neighborhood or location is based on the proximity and density of destinations reachable on foot, such as grocery stores, schools, parks, restaurants, and transit stops. Services like walkscore.com have made walkability indices…

Watershed Algorithm(also: Watershed Segmentation, Watershed Transform)

An image segmentation technique inspired by geographical hydrology, where the gradient magnitude of an image is treated as a topographical surface. The algorithm simulates water flowing downhill from each pixel to local minima, forming catchment basins that define segmented…

Wav2Vec(also: Wav2Vec2, Wav2Vec 2.0)

A family of self-supervised speech representation models from Meta AI that learn rich acoustic embeddings directly from raw waveform audio without requiring transcribed training data. Wav2Vec 2.0, introduced in 2020, became a backbone for low-resource automatic speech…

Wavefront Analyzer(also: Aberrometer, Wavefront Sensor)

An optical instrument that measures how light waves are distorted as they pass through the eye's optical system, producing a detailed map of the eye's refractive characteristics called a wavefront aberration function. Unlike standard eye exams that measure only basic refractive…

Wayfinding(also: Navigation, Orientation and mobility)

The process by which people orient themselves in physical or digital spaces, determine their destination, and navigate a route to reach it. Wayfinding encompasses the cognitive, sensory, and physical strategies people use to understand where they are, where they need to go, and…

Wayfinding(also: Navigation, Orientation)

The process by which people orient themselves and navigate through physical or digital environments. Accessible wayfinding encompasses multiple modalities: visual signage with sufficient contrast and text size, tactile maps and guidance paths for blind users, audio announcements…

Weak Central Coherence(also: WCC, Central Coherence Theory)

A cognitive theory proposing that individuals with autism tend to process information in a detail-focused, piecemeal way rather than integrating it into a coherent whole. In the context of web accessibility, weak central coherence means autistic users may focus intensely on…

Wearable Assistive Technology(also: Wearable AT, Assistive Wearables)

Electronic devices worn on the body—such as smartwatches, smart glasses, rings, or headbands—that provide assistive functionality for people with disabilities. Wearable assistive technology leverages built-in sensors (accelerometers, gyroscopes, cameras) and connectivity to…

Wearable Camera(also: Body-worn Camera, Head-mounted Camera, Egocentric Camera)

A camera worn on the body — typically mounted on glasses, a hat, or the chest — that captures images or video from the wearer's perspective (egocentric view). In assistive technology for blind and low vision users, wearable cameras coupled with computer vision can provide…

Wearable Computing(also: Wearable Technology, Wearables)

Electronic devices and computing systems designed to be worn on the body, integrated into clothing, or carried as accessories. Wearable computers can continuously monitor the user and their environment, providing real-time feedback, navigation assistance, health monitoring, or…

Wearable Haptic Device(also: Haptic Wearable, Vibrotactile Wearable)

A body-worn device that delivers tactile feedback through vibration motors, actuators, or other mechanisms to convey information to the wearer through the sense of touch. Wearable haptic devices range from simple single-motor wristbands to multi-motor armbands, gloves, and belts…

Wearable Haptics(also: Wearable Haptic Device)

Haptic feedback systems designed to be worn on the body — rings, wristbands, gloves, vests, shoes, or exoskeletons — that deliver tactile, vibrotactile, or kinesthetic cues during mobile, hands-free use. Wearable haptics are a core building block of assistive navigation,…

Wearable Immersive Virtual Reality(also: WIVR, Wearable VR)

A category of virtual reality systems designed to be worn on the body, typically using lightweight, portable headsets such as smartphone-based viewers (e.g., Google Cardboard). WIVR prioritizes affordability, portability, and ease of use over the high fidelity of tethered VR…

Wearable Sensing(also: Wearable Sensors, Wearable Monitoring)

The use of body-worn devices such as smartwatches, wristbands, and biosensor patches to continuously monitor physiological signals including heart rate, electrodermal activity, skin temperature, blood volume pulse, and body movement. In mental health applications, wearable…

Wearable Sensor(also: Body-Worn Sensor, Wearable Device)

A small electronic device worn on the body that continuously collects data about the wearer's movements, physiological state, or environment. In accessibility and rehabilitation contexts, wearable sensors such as accelerometers, gyroscopes, and inertial measurement units can…

Wearable Sensors(also: Body-Worn Sensors, Wearable Sensor Technology)

Electronic devices worn on the body that collect data about movement, physiological signals, or environmental conditions. In accessibility contexts, wearable sensors include accelerometers, gyroscopes, and inertial measurement units (IMUs) embedded in clothing, shoes, watches,…

Wearable Technology(also: Wearables, Wearable Devices)

Electronic devices designed to be worn on the body, such as smartwatches, fitness trackers, smart glasses, and haptic wristbands. In accessibility contexts, wearable technology offers unique advantages for delivering notifications and information through multiple sensory…

Web 2.0(also: Web Two Point Oh, The Read-Write Web)

Web 2.0 refers to the shift in web development that emerged in the early 2000s, characterized by user-generated content, dynamic interfaces, rich interactivity, and social participation rather than static page delivery. For accessibility, Web 2.0 introduced significant…

Web Accessibility(also: Website Accessibility, Digital Web Accessibility)

The inclusive practice of ensuring that all people, particularly disabled and older people, can use websites in a range of contexts of use, including with mainstream and assistive technologies. Achieving web accessibility requires that websites be designed and developed to…

Web Accessibility Assessment(also: Accessibility Evaluation, Accessibility Audit, Web Accessibility Testing)

The process of evaluating websites and web applications to determine how well they meet accessibility standards and guidelines, typically WCAG. Assessment methods include automated testing with evaluation tools, manual expert review, and user testing with people with…

Web Accessibility Audit(also: Accessibility Audit, WCAG Audit)

A systematic evaluation of a website or web application against accessibility standards (typically WCAG) to identify barriers that prevent people with disabilities from accessing content. Audits may be automated (using tools like Google Lighthouse, axe, or WAVE), manual (expert…

Web Accessibility Barrier(also: WAB, Accessibility Barrier)

Any element, design pattern, or technical implementation on a web page that prevents or hinders people with disabilities from accessing, understanding, or interacting with content. Common web accessibility barriers include images without alternative text, videos without…

Web Accessibility Barrier Score(also: WAB, WAB Score)

A quantitative metric for measuring the accessibility level of a website, defined as the mean value of the failure rate of accessibility checkpoints on a page, weighted by the priority of each checkpoint. The failure rate is the number of violations of a checkpoint divided by…

Web Accessibility Directive(also: WAD, Directive 2016/2102)

A European Union directive adopted in 2016 requiring all public sector bodies in EU member states to make their websites and mobile applications accessible. The directive mandates compliance with EN 301 549 (which incorporates WCAG 2.1 AA) and requires public sector…

Web Accessibility Evaluation(also: Accessibility Assessment, Accessibility Review)

The process of assessing whether a website or web application meets accessibility standards and can be used by people with disabilities. Evaluation methods include automated testing using tools like axe-core, WAVE, or Lighthouse; manual expert review against WCAG success…

Web Accessibility Initiative(also: WAI)

A program of the World Wide Web Consortium (W3C) that develops strategies, standards, and supporting resources to make the web accessible to people with disabilities. Founded in 1997, WAI is responsible for producing the Web Content Accessibility Guidelines (WCAG), the Authoring…

Web Accessibility Quantitative Metric(also: WAQM)

An accessibility evaluation metric that calculates a quantitative score for a website based on automatically generated evaluation reports. WAQM computes the failure rate for each tested page, then derives the overall website accessibility value by weighting pages according to…

Web Accessibility Remediation(also: Accessibility Remediation, A11y Remediation)

The process of identifying and fixing accessibility barriers in existing websites and digital content to bring them into compliance with standards like WCAG. Remediation can be manual (developers editing HTML, CSS, and ARIA directly), semi-automated (using tools that detect…