WCAG（ウェブコンテンツアクセシビリティガイドライン）
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W3Cが公開した国際標準で、障害のある人々がウェブコンテンツにアクセスしやすくするための方法を定義し、色のコントラストに関する具体的な基準を含む。
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.