Contrast (Minimum) (1.4.3)

Text and important visual elements need sufficient contrast to remain readable.

WCAG Reference

Applies to: WCAG 2.0, WCAG 2.1, WCAG 2.2 Introduced in: WCAG 2.0 | Level: AA | Read the official specification →

What this rule checks

This rule checks whether text and important UI elements meet the minimum contrast requirements needed for readable, usable interfaces.

Why it matters

Low contrast makes content difficult to read for users with low vision, color-vision differences, or difficult viewing conditions.

Common failure patterns

• light gray text on a white background
• status text that uses color with weak contrast
• disabled-looking controls that are still interactive

Remediation guidance

• increase the contrast between foreground and background colors
• verify contrast after hover, focus, and active-state styling is applied
• avoid relying on color tokens that look correct in one theme but fail in another

Related docs

• Web Rule Repository
• Accessibility Issue Remediation Guide