Fourth WCAG POUR principle: content must work with various assistive technologies and remain functional as technologies advance.
Mechanisms such as skip links and landmarks that let users jump past repeated content directly to main sections.
Single‑letter keyboard shortcuts that must be remappable, turned off, or only active on focus to prevent accidental activation.
Numeric ratio expressing luminance difference between two colors. Common thresholds: 4.5:1 for normal text, 3:1 for large text or UI.
In WCAG, a guideline groups related success criteria under the POUR principles and provides intent and techniques.
Transient content that appears on hover or focus, which must be dismissible, hoverable, and persistent while being hovered.
One of the four WCAG POUR principles: information and UI components must be presented in ways users can perceive.
This glossary is continuously improved and maintained by WebAbility to advance accessible design and development.Contact us to suggest improvements or report issues.