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WCAG 2 (1.4.3 and 1.4.6): Contrast

• Level AA and Level AAA Conformance
• Ratios
• 3:1 minimum acceptable contrast for standard text and vision
• 4.5:1 accounts for moderately low visual acuity (vision loss equivalent to approximately 20/40)
• typical visual acuity of people at roughly age 80
• 7:1 accounts for users who typically do not depend on assistive technologies for visual impairments (vision loss equivalent to approximately 20/80)