Glossary

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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-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…

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 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…

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 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…

Web Adaptation(also: Content Adaptation, Web Content Adaptation)

The process of automatically modifying web content to improve usability, accessibility, or presentation for specific users, devices, or contexts. Web adaptation techniques include restructuring page layouts, generating content summaries, creating hierarchical outlines of page…

Web Agent(also: Autonomous Web Agent, Browser Agent)

An AI system that can autonomously perform tasks on websites by interpreting user goals and executing actions such as clicking, typing, and navigating. Web agents often use large language models or multimodal models to interpret page content and determine appropriate actions.…

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

Web authoring is the creation and editing of webpage content and structure, historically by writing HTML, CSS, and JavaScript, and increasingly through graphical WYSIWYG tools (Figma, Wix, Squarespace, WordPress block editors, Google Sites). Authoring tools are themselves…

Web Automation(also: Browser Automation, Web Macro)

The process of automating browsing actions on behalf of a user, such as filling forms, navigating between pages, clicking links, or extracting content. Web automation can be achieved through macros (pre-recorded sequences of instructions), scripted approaches, or Programming by…

Web Clutter(also: Page Clutter, Visual Clutter)

Non-essential elements on a web page that do not contribute to the primary content or user task, such as advertisements, decorative images, redundant navigation, social media widgets, and promotional banners. Web clutter disproportionately affects users of assistive…

Web Complexity(also: Page Complexity, Website Complexity)

A measure of the technical sophistication and structural density of a web page, typically assessed by the number and types of HTML elements, scripts, embedded objects, and interactive features present. In accessibility research, web complexity is an important factor because more…

Web Compliance Engineering

A discipline within Web Engineering focused on the application of quality assurance, testing, and management processes to ensure that web applications conform to standards, policy environments, and other quality criteria such as accessibility requirements. Web Compliance…

Web Composition(also: Component-Based Web Development)

Web composition is the practice of building web pages by dynamically combining smaller, reusable pieces of HTML markup — often called snippets, components, or fragments — into complete pages. Modern web frameworks like React, Angular, and Vue are built around this compositional…

Web Content Filtering(also: Content Filtering, Page Filtering)

The process of selectively displaying or hiding elements on a webpage based on specified criteria. Web content filtering encompasses both type-based filtering (e.g., ad blockers that remove advertisements) and relevance-based filtering (e.g., task-specific systems that assess…

Web Inclusion(also: Digital Inclusion, Web for All)

The principle and practice of ensuring that the web is usable by and beneficial to all people, regardless of disability, language, literacy, cultural background, technical proficiency, or socio-economic status. Web inclusion extends beyond traditional web accessibility by…

Web Interaction Environment(also: WIE)

A modelling concept defined as a particular audience group's set of intrinsic characteristics upon which tailored evaluation procedures can be applied to a website. Introduced by Lopes and Carrico (2008), WIEs organize user characteristics across four domains: Users (abilities,…

Web Intermediary(also: Web Proxy, Transcoding Proxy)

A system that sits between a user's web browser and the web server, intercepting and modifying HTTP requests and responses to adapt web content before it reaches the user. In accessibility contexts, web intermediaries can transform web pages to make them more accessible — for…

Web Mediation(also: Web Content Mediation, Web Accessibility Mediation)

The process of automatically modifying web content as it passes between a web server and a user's browser, typically through a proxy server or browser extension, to improve its accessibility or usability. Web mediation can add missing accessibility features (such as generating…

Web Mobility(also: Hypertext Mobility, Web Navigation Mobility)

A conceptual framework that applies principles of physical mobility and wayfinding to web navigation, particularly for visually impaired users. Web mobility encompasses the ability to move through hypertext with purpose, ease, and accuracy, requiring knowledge of current…

Web Navigation(also: Website Navigation, Web Browsing Navigation)

The process of moving through and finding information on websites, encompassing strategies like following links, using search, scanning headings, and interacting with menus and filters. Web navigation presents fundamentally different experiences depending on access method:…

Web Page Complexity(also: Page Complexity, Structural Complexity)

A measure of how much a web page contains in terms of interactivity, embedded media, and structural richness. The W3C's WCAG-EM defines complexity through three factors: level of interactivity, source and method of content generation, and implementation style. Quantitative…

Web Page Preview(also: Page Preview, Link Target Preview)

A summary or representation of a web page's content provided to users before they navigate to that page, allowing them to assess its relevance without committing to a full visit. For sighted users, visual previews like thumbnails or pop-up snippets serve this purpose. For screen…

Web Page Segmentation(also: Page Segmentation, Visual Page Segmentation)

The process of dividing a web page into its constituent visual blocks or semantic regions, such as headers, navigation menus, content areas, sidebars, and footers. Segmentation algorithms analyse both the source code (DOM structure) and the visual rendering of pages to identify…

Web Proxy(also: HTTP Proxy, Intermediary, Edge Service)

A web proxy (or intermediary) is a server that sits between a user's browser and the origin web server, intercepting and potentially modifying HTTP requests and responses as they pass through. In the context of accessibility, proxy-based systems have been used to transform web…

Web Readability(also: Online Readability)

The ease with which web content can be read and understood, encompassing both visual factors (typography, layout, color, responsive design) and linguistic factors (vocabulary, sentence complexity, content structure). Web readability has been the dominant focus of reading support…

Web Segmentation(also: Page Segmentation, Web Page Segmentation)

The process of dividing a web page into distinct, meaningful sections or segments based on visual layout, structural markup, or content semantics. Web segmentation is important for accessibility because screen readers typically narrate content in DOM order, which may not reflect…

Web Transcoding(also: Content Transcoding, Web Page Transcoding)

The process of transforming or reformatting web page content to make it more accessible or usable in different contexts. Transcoding techniques include removing irrelevant elements, reordering content, adding skip links, and simplifying page structure. Originally developed to…

Web Transcoding(also: Content Transcoding, Web Content Transformation)

The process of automatically transforming web content to improve its presentation or accessibility for specific users or devices. Transcoding techniques can include simplifying page structure, adapting content for different screen sizes, or modifying text for users with…

Web Widget(also: Widget, UI Widget, Web Component)

A discrete, interactive user interface element within a web page that allows users to perform specific actions or view dynamic content. Widgets range from simple controls like checkboxes and dropdown menus to complex components like date pickers, chat windows, autocomplete…

Web disorientation(also: Lost in hyperspace, Navigation disorientation)

The feeling of being lost or confused while navigating websites, characterized by difficulty knowing one's current location within a site, how to return to previously visited pages, or how to find desired information. Web disorientation is predicted by Internet confidence and…

WebAIM(also: Web Accessibility In Mind)

WebAIM (Web Accessibility In Mind) is a non-profit organization based at the Center for Persons with Disabilities at Utah State University, founded in 1999 and recognized internationally as a leading provider of web accessibility expertise, training, and tooling. WebAIM produces…

WebAIM Million(also: WebAIM Million Report, The WebAIM Million)

An annual accessibility evaluation study conducted by WebAIM (Web Accessibility In Mind) that automatically tests the home pages of the top one million websites against WCAG 2 success criteria. The study has become a key benchmark for measuring the state of web accessibility…

WebAnywhere

A web-based, self-voicing screen reader developed at the University of Washington that enabled blind users to access the web from any computer with an Internet connection and sound output, without installing software. Launched in 2008, WebAnywhere ran entirely within a standard…

Widget(also: UI Widget, Web Widget, Interactive Component)

A discrete user interface object that users can interact with, such as a dropdown menu, slider, tab panel, date picker, modal dialog, or autocomplete field. The W3C defines a widget as a "discrete user interface object with which the user can interact." In web accessibility,…

Widget accessibility(also: ARIA widget roles, Custom control accessibility)

The practice of ensuring that interactive user interface components — such as drop-down menus, tab panels, accordions, modal dialogs, and sliders — are operable and perceivable by users of assistive technologies. Widget accessibility requires correct implementation of WAI-ARIA…

Windowless Mode(also: Flash wmode transparent, wmode=transparent)

Windowless mode is a legacy Adobe Flash rendering option (wmode=transparent or wmode=opaque) in which the Flash player drew into the browser's graphics surface directly rather than into its own dedicated OS window. It was commonly used so that HTML content could overlap Flash…

Wrapper(also: Web Wrapper, Data Wrapper)

In web accessibility and data extraction contexts, a reusable program that maps the visual layout of a web page to its underlying structured dataset by identifying records and fields within the HTML. Wrappers reverse the rendering process, extracting semantic structure from…

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