WCAG requirement to clearly identify and describe input errors to users in text form.
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.
Design patterns that reduce mistakes (confirmation, reversible actions, previews) required for important transactions by WCAG.
Clear, actionable guidance to fix mistakes, including inline error messages associated with inputs via aria-describedby.
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