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glossary

Contrast Ratio

The difference in luminance between text and background colors, required to be at least 4.5:1 for WCAG AA compliance.

Last updated: December 16, 2025

Definition

The difference in luminance between text and background colors, required to be at least 4.5:1 for WCAG AA compliance.

Why It Matters

Understanding this concept is crucial for implementing accessible, user-friendly interfaces that comply with web standards.

Examples

Common real-world implementations and usage patterns for this concept.

Best Practices

  • Follow WCAG guidelines when applicable
  • Test with assistive technologies
  • Document your implementation decisions

FAQ

What is wcag 2.1 compliance checklist?

For Contrast Ratio, start with a quick audit, then validate the issue manually with real users or assistive tech. Use a focused checklist and document what changes when you remediate the issue.

How do you fix wcag 2.1 compliance checklist?

For Contrast Ratio, start with a quick audit, then validate the issue manually with real users or assistive tech. Address wcag 2.1 compliance checklist by fixing the root cause, then re-test the exact flow to confirm the issue no longer reproduces.

How do you test for wcag 2.1 compliance checklist?

For Contrast Ratio, start with a quick audit, then validate the issue manually with real users or assistive tech. Run automated checks, then verify by hand (keyboard, screen reader, or device-specific checks) to catch edge cases.

What is fix color contrast issues?

For Contrast Ratio, start with a quick audit, then validate the issue manually with real users or assistive tech. Use a focused checklist and document what changes when you remediate the issue.

How do you fix fix color contrast issues?

For Contrast Ratio, start with a quick audit, then validate the issue manually with real users or assistive tech. Address fix color contrast issues by fixing the root cause, then re-test the exact flow to confirm the issue no longer reproduces.

How do you test for fix color contrast issues?

For Contrast Ratio, start with a quick audit, then validate the issue manually with real users or assistive tech. Run automated checks, then verify by hand (keyboard, screen reader, or device-specific checks) to catch edge cases.

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