WCAG (Pautas de Accesibilidad para el Contenido Web)
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Un estándar internacional publicado por el W3C que define cómo hacer el contenido web accesible para personas con discapacidades, incluidos criterios específicos para el contraste de color.
WCAG provides three conformance levels: A (minimum), AA (standard), and AAA (enhanced). For color, the key success criteria are 1.4.3 (Contrast Minimum, level AA) requiring 4.5:1 for normal text and 3:1 for large text, and 1.4.6 (Enhanced Contrast, level AAA) requiring 7:1 for normal text and 4.5:1 for large text. WCAG 2.1 (current) also requires that color is not the only means of conveying information (1.4.1). Most legal accessibility requirements in the US (Section 508), EU (EN 301 549), and other jurisdictions reference WCAG AA as the minimum standard.