Requirement that content supports 320 CSS px viewport width without loss of information or functionality and without horizontal scroll.
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.
Ability of content to adapt without loss of information or functionality when zoomed up to 400% or on small screens.
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.
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