Glossary
Searchable terminology from accessibility, web standards, and related fields.
6660 terms — page 137 of 333
- Guiard's Theory of Asymmetric Bimanual Action (Guiard kinematic chain model, Asymmetric bimanual action model)
- Yves Guiard's 1987 model describing how the two hands typically take complementary, asymmetric roles in everyday manual tasks. The non-dominant hand sets a coarse spatial frame of reference that the d…
- Guide Dog (Seeing Eye Dog, Service Dog, Dog Guide)
- A specially trained assistance animal that helps blind or visually impaired individuals navigate their environment safely. Guide dogs are trained to avoid obstacles, stop at curbs and steps, and navig…
- Guide Runner (Sighted Guide Runner, Running Guide)
- A sighted person who accompanies a blind or visually impaired runner during training or competition, providing verbal navigation cues and physical guidance typically through a tether connecting the tw…
- Guide-by-Pointing (Point-and-Ask, Hand-Guided Visual Query)
- A prompting technique for multimodal AI assistants where a user extends their hand into the camera's field of view and asks the AI to identify what they are pointing at, or to provide spatial directio…
- Guided Error Training (Error-Based Training, Productive Failure)
- An instructional method where learners observe or experience common errors along with their corrections, rather than only seeing error-free demonstrations. Research shows this approach helps build mor…
- Guided Incremental Search (Step-by-Step Search, Faceted Browsing)
- A web navigation pattern in which users are led through a series of small, sequential choices — such as selecting categories, subcategories, and filters — to progressively narrow search results toward…
- Guided Participation
- Guided participation is a concept from Barbara Rogoff's developmental psychology describing how children learn through engaged collaboration with more experienced partners in everyday shared activitie…
- Guided Tour (Guided Tour Navigation, Linear Navigation Pattern)
- A web navigation pattern that sequentially links content pages in a collection, allowing users to browse items one by one using next and previous controls rather than returning to an index page betwee…
- Gulf of Execution
- A concept from Don Norman's theory of action describing the gap between a user's intention and the actions available to achieve that goal through an interface. When the gulf of execution is large, use…
- Gunning Fog Index (Gunning FOG, FOG Index)
- A traditional readability formula developed by Robert Gunning in 1952 that estimates the years of formal education a reader needs to understand a text on first reading. It is calculated from average s…
- Gyroscope (Gyro Sensor)
- A sensor that measures rotational velocity around one or more axes, detecting how quickly a device is being turned or twisted. Combined with accelerometers in an inertial measurement unit, gyroscopes …
- HAAT Model (Human Activity Assistive Technology Model)
- A conceptual framework for understanding and designing assistive technology systems that identifies four interconnected components: the human user, the activity being performed, the assistive technolo…
- HCI4D (Human-Computer Interaction for Development)
- A subfield of human-computer interaction that focuses on designing and evaluating interactive technologies specifically for development contexts, addressing the needs of underserved and marginalized c…
- HHS Usability Guidelines (Research-Based Web Design and Usability Guidelines, Usability.gov Guidelines)
- A comprehensive set of evidence-based web design and usability guidelines published by the U.S. Department of Health and Human Services (HHS). The guidelines cover areas including homepage design, pag…
- HIPAA (Health Insurance Portability and Accountability Act)
- A 1996 United States federal law that establishes national standards for the protection of certain health information. HIPAA's Privacy Rule governs who may access protected health information (PHI), w…
- HSL (Hue Saturation Luminosity, HSL Color Model, HSB)
- A colour model that represents colours using three components: Hue (the type of colour, such as red, green, or blue, expressed as a degree on a colour wheel from 0 to 360), Saturation (the purity or i…
- HTML (HyperText Markup Language)
- The standard markup language used to create and structure content on the World Wide Web. HTML uses elements (tags) to define the semantic structure of documents, including headings, paragraphs, links,…
- HTML Canvas (Canvas API, Canvas Element)
- An HTML element used to draw graphics on a web page via JavaScript, rendering content as a bitmap image rather than as structured DOM elements. Unlike SVG, canvas content is not inherently accessible …
- HTML Frame (Frame, Frameset, IFrame)
- An HTML element that divides a web page into multiple independent sections, each displaying a separate document. Framesets (using the frame and frameset elements) split the browser window into distinc…
- HTML Remediation (Accessibility Remediation, A11y Remediation)
- The process of modifying HTML code to fix accessibility violations and bring web content into conformance with accessibility guidelines like WCAG. Remediation can involve adding missing attributes (al…