Glossary
Searchable terminology from accessibility, web standards, and related fields.
178 results found in web accessibility.
- MutationObserver (DOM Mutation Observer, Mutation Records API)
- An HTML5 browser API that monitors and reports changes to the Document Object Model (DOM) structure of a web page in real time, including additions and removals of elements, attribute changes, and tex…
- National Accessibility Portal (NAP, South African National Accessibility Portal)
- A South African government-supported web portal developed by the Meraka Institute (CSIR) to provide accessible information sharing for the disability sector. The NAP was designed from inception as an …
- 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…
- Near-Duplicate Pages (ND Pages, Near-Duplicate Web Pages)
- Near-duplicate pages are web pages that belong to the same functional state from a testing perspective but exhibit low visual or structural similarity due to dynamic content differences. Common causes…
- Non-Visual Web Browser (Self-Voicing Browser, Audio Web Browser, Talking Browser)
- A web browser specifically designed for users who cannot see the screen, providing audio-based or haptic interfaces for navigating and interacting with web content. Unlike standard screen readers that…
- Opportunistic Accessibility (Opportunistic Accessibility Improvement)
- Opportunistic accessibility is an approach to improving digital accessibility in which enhancements are automatically applied to the maximum extent possible without causing negative side effects. Rath…
- Overlay Fact Sheet (Accessibility Overlay Fact Sheet)
- A public document signed by over 600 accessibility experts, lawyers, and contributors to web accessibility guidelines that critically evaluates the claims made by accessibility overlay vendors. The fa…
- Page Linearization (Content Linearization, DOM Linearization, Source Order)
- The process by which screen readers and other assistive technologies present web page content as a sequential, one-dimensional stream of text, typically following the order of elements in the HTML sou…
- Page Sampling (Page Selection Strategy, Website Sampling)
- The methodology used to select which pages within a website will be evaluated during an accessibility assessment. Common strategies include evaluating only the home page, testing specific page types (…
- Page Segmentation (Web Page Segmentation, VIPS)
- The process of dividing a web page into distinct visual or structural blocks based on layout cues such as whitespace, borders, colors, and font properties. Page segmentation algorithms like Vision Bas…
- 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…
- Personalized Accessibility (Personalized Web Accessibility, User-Tailored Accessibility)
- An approach to accessibility evaluation and design that considers the specific disability profile, capabilities, and needs of individual users rather than treating accessibility as a single universal …
- Photophobia (Light Sensitivity)
- A genuine physiological sensitivity to bright light, flickering light, or intense visual patterns that causes symptoms such as headaches, migraines, nausea, dizziness, and disorientation. Despite its …
- Photosensitivity (Photosensitive Epilepsy, PSE)
- A neurological condition in which exposure to flickering light patterns, flashing graphics, or rapid luminance changes triggers physiological responses including seizures, migraines, nausea, dizziness…
- Photosensitivity (Light Sensitivity, Photophobia)
- An abnormal sensitivity to light that can cause discomfort, pain, or visual disturbance. Photosensitivity affects many people with visual impairments and certain neurological conditions including migr…
- Platform Accessibility
- The degree to which online platforms (websites, apps, social media, marketplace platforms) are usable by and inclusive of disabled people. Platform accessibility encompasses not only technical complia…
- Print Illiteracy (Alipi)
- A condition where a literate person is unable to meaningfully access or use written web content, not because they cannot read, but because the content is presented in a language, script, or format the…
- Prosumer (Producer-Consumer, Prosumer Content Creator)
- A person who both produces and consumes content, particularly on the web. Prosumers are not formally trained in web design or development but are responsible for creating and managing user-generated c…
- Proxy Interface (Accessibility Proxy, Alternative Interface)
- An intermediary user interface that sits between the user and the original content, re-presenting information in a more accessible format without modifying the underlying source. In accessibility cont…
- Re-narration (Web Re-narration, Content Re-narration)
- The process of creating alternative versions of web content — such as translations, simplifications, audio descriptions, or culturally adapted media — to make it accessible to audiences who cannot eff…