Check the contrast ratio between a text color and background color against WCAG AA and AAA accessibility standards.
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Contrast ratio is calculated from the relative luminance of both colors using the WCAG formula, producing a ratio from 1:1 (identical colors, no contrast) up to 21:1 (pure black on pure white, maximum contrast).
WCAG AA requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (18pt or larger, or 14pt bold). WCAG AAA is stricter, requiring 7:1 for normal text and 4.5:1 for large text. AA is the commonly required standard for most websites.
WCAG AA is the widely recommended minimum standard for web accessibility and is often a legal requirement in many jurisdictions. AAA is a stricter, optional standard for enhanced accessibility.
Yes, large text (18pt+/24px+, or 14pt/19px+ bold) has lower minimum contrast requirements than normal-sized text, since larger text is inherently easier to read at lower contrast.
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