Glossary
Searchable terminology from accessibility, web standards, and related fields.
30 results found in WCAG.
- Accessibility Baseline (Baseline, Technology Baseline, WCAG Baseline)
- An accessibility baseline, as used in WCAG 2.0 and later versions, is the set of technologies that a content author assumes are supported and enabled in the user agents (browsers and assistive technol…
- Accessibility Conformance Level (WCAG Conformance Level, Conformance Level)
- Accessibility conformance levels are the tiered ratings defined by the Web Content Accessibility Guidelines (WCAG) to indicate the degree to which web content meets accessibility success criteria. WCA…
- Accessibility-supported (Accessibility supported technology)
- A WCAG 2.0 concept describing a web technology that has sufficient support from user agents (browsers) and assistive technologies to reliably convey accessibility information to users with disabilitie…
- Accessible Authentication (WCAG 3.3.7, Accessible Authentication (Minimum))
- A web accessibility requirement introduced in WCAG 2.2 (Success Criterion 3.3.7) that mandates for each step in an authentication process relying on a cognitive function test — such as remembering a p…
- Alternative Text (Alt Text, Alt Attribute)
- Text associated with an image that serves the same purpose and conveys the same essential information as the image. Alternative text is a fundamental web accessibility requirement specified in WCAG, e…
- Checkpoint (WCAG Checkpoint, Success Criterion, Accessibility Checkpoint)
- A checkpoint is a specific, testable accessibility requirement in a set of guidelines — for example, 'provide a text equivalent for every non-text element' is WCAG 1.0 checkpoint 1.1. The term is stro…
- Conformance Level (WCAG Level, Priority Level)
- The three-tiered classification system used by WCAG to rank success criteria by their importance and impact on accessibility. Level A represents the minimum baseline — criteria that must be met or som…
- Contrast Ratio (Color Contrast Ratio, Luminance Contrast Ratio)
- A numerical measure of the difference in perceived brightness between two colors, expressed as a ratio ranging from 1:1 (no contrast) to 21:1 (maximum contrast, black on white). WCAG 2.2 requires a mi…
- Epilepsy (Seizure Disorder)
- A chronic neurological condition characterized by recurrent, unprovoked seizures caused by abnormal electrical activity in the brain. Epilepsy affects roughly 1% of the population globally and spans a…
- Extended Audio Description (Extended AD, Paused Audio Description)
- A form of audio description in which the video is temporarily paused to allow time for a longer, more detailed description of visual content before resuming playback. Extended AD is used when gaps bet…
- Flashing Content (Flashing, Flash)
- Visual content that alternates between contrasting states at a rate that can trigger seizures in people with photosensitive epilepsy. WCAG defines a flash as a pair of opposing luminance changes or a …
- Focus Indicator (Focus Ring, Visible Focus, Focus Outline)
- A visual cue that shows which interactive element on a page or in an application currently has keyboard focus. Focus indicators are typically rendered as an outline, border, or highlight around the fo…
- Inline Audio Description (Standard Audio Description, Inline AD)
- The standard form of audio description where narrated descriptions of visual content are inserted into natural pauses in dialogue and sound during video playback, without pausing the media. Inline AD …
- Interface Consistency (Consistent Navigation, Consistent Identification, UI Consistency)
- Interface consistency is a design principle requiring that navigational mechanisms, visual layouts, and interactive components appear and behave in the same way across different pages, screens, or app…
- Link Purpose (Link Purpose (In Context), WCAG 2.4.4, Link Text)
- A WCAG 2.4.4 Level A success criterion requiring that the purpose of each link be determinable from the link text alone, or from the link text together with its programmatically determined context (su…
- Long Description (Extended Description, longdesc)
- A detailed textual description of an image or other non-text content that goes beyond the brief summary provided by alt text. Long descriptions are used for complex images such as charts, diagrams, in…
- On Input (WCAG 3.2.2)
- WCAG 2.1 success criterion 3.2.2 (Level A) requires that changing the setting of any user interface component does not automatically cause a change of context (e.g., submitting a form, navigating to a…
- 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 …
- Perceivability (Perceivable)
- The quality of information or interface elements being detectable through one or more senses — sight, hearing, or touch. Perceivability is the first principle of WCAG 2.0 and requires that information…
- Success Criteria (Success Criterion, SC)
- The testable statements within the Web Content Accessibility Guidelines (WCAG) that define specific requirements for making web content accessible. Each success criterion is assigned a conformance lev…