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Plain-language answers about accessibility and on-page SEO. Legal information is general context, not legal advice.

• Colour contrast · WCAG 1.4.3 · 5 min read · 5 November 2026

  WCAG contrast ratio: 4.5:1, 3:1 and 7:1, with the formula and fixes

  WCAG asks for 4.5:1 contrast for normal text, 3:1 for large text and UI components. Get the formula, a worked example and how to fix a failing colour.