WCAG (웹 콘텐츠 접근성 지침)
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W3C가 발행한 국제 표준으로, 색상 대비에 관한 구체적 기준을 포함하여 장애가 있는 사람들도 웹 콘텐츠에 접근할 수 있도록 하는 방법을 정의함.
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.