Glossary
Searchable terminology from accessibility, web standards, and related fields.
212 results found in Web Accessibility.
- 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 …
- Page Fragmentation (Visual Fragmentation, Content Fragmentation)
- A web accessibility problem where different types of content on a web page (news articles, advertisements, navigation menus, related links) are visually grouped using colours, spacing, images, and lay…
- Page Landmarks (ARIA Landmarks, Landmark Regions, Landmark Roles)
- Named regions of a web page that identify its high-level structure — for example banner, navigation, main, complementary, search, form, contentinfo — so that assistive technology can expose them as ju…
- Page Magnification (Page Zoom, Web Page Magnification)
- An accessibility feature that enlarges the entire visual presentation of a web page, including text, images, and layout elements, to make content easier to see for people with low vision or visual fat…
- Page Structure Preservation (Layout Preservation, Structure Retention)
- The principle of maintaining the original spatial layout and DOM structure of a webpage when applying accessibility enhancements, content filtering, or other modifications. Preserving page structure e…
- Perceived Accessibility (Subjective Accessibility, Accessibility-in-Use)
- Perceived accessibility refers to the subjective quality by which users experience the accessibility of a website or application, as opposed to its objective compliance with accessibility standards. R…
- Plain Language (Plain English, Clear Language, Simple Language)
- Plain language is communication that is clear, concise, and well-organized so that the intended audience can easily find, understand, and use the information. In accessibility, plain language is essen…
- Plain language (Plain English, Easy read, Simple language)
- A communication approach that uses clear, concise, and well-organised writing designed to be understood the first time it is read. Plain language avoids jargon, complex sentence structures, and ambigu…
- Presentation Independence (Presentation-Independent Information)
- The principle that information should be stored and served in formats that can be rendered in visual, auditory, or electronic text form without loss of meaning. Presentation-independent content has no…
- Procedural Accessibility
- An aspect of web accessibility that addresses the consistency and clarity of interaction sequences and workflows within digital systems. Procedural accessibility ensures that similar services follow t…
- Random Walk (Random Walk Sampling)
- In web-accessibility evaluation, a random walk is a probabilistic sampling method that starts from a seed page (typically the home page) and follows outgoing links according to a probability rule — fo…
- Readability (Text Readability)
- The ease with which a reader can read and understand written text. Readability encompasses both visual readability (typography, layout, color contrast, spacing) and linguistic readability (vocabulary …
- Reading accessibility (Readable content, Text accessibility)
- The design of written content and reading interfaces to be usable by people with diverse literacy levels, cognitive abilities, language backgrounds, and sensory capabilities. Reading accessibility enc…
- Relevance Scoring (Task Relevance Score, Content Relevance Rating)
- The assignment of numerical scores to web page elements indicating how relevant they are to a user's specified task or goal. In systems like Task Mode, relevance scores typically range from 0 (complet…
- Relevance Threshold (Filtering Threshold, Display Threshold)
- A user-adjustable cutoff value that determines which content elements are displayed or hidden based on their relevance scores. Elements scoring above the threshold are shown; those below are de-emphas…
- Retrofit Accessibility (Accessibility Retrofitting, Bolt-On Accessibility)
- The practice of adding accessibility features to a product, system, or interface after it has already been designed and built for non-disabled users. Retrofit accessibility often results in suboptimal…
- Rich Text (Formatted Text, Styled Text)
- Text content that includes visual formatting attributes beyond plain characters, such as font size, font family, color, bold, italic, underline, and other styling properties. On the web, rich text is …
- Role Attribute (ARIA Role, WAI Role)
- An HTML attribute that defines the purpose or type of a user interface element, communicating its function to assistive technologies. Originally proposed as part of the XHTML namespace-based approach …
- SERPA (Streamlined Evaluation and Reporting Process for Accessibility)
- A programmer-centric methodology for conducting and reporting website accessibility evaluations, proposed by Law, Jacko, and Edwards in 2005. SERPA restructures the traditional accessibility evaluatio…
- Scanning Navigation (Non-Visual Scanning, Auditory Scanning)
- A non-visual navigation strategy in which a screen-reader or voice-browser user steps rapidly through a page one fragment at a time — line by line, item by item, or in fixed jumps (e.g. page-down keys…