WCAG 1.4.6 Contrast (Enhanced)

What WCAG 1.4.6 Requires

AAA only: an enhanced contrast ratio of 7:1 for normal text and 4.5:1 for large text, higher than the AA minimum, for visitors who need stronger contrast.

How to Test It by Hand

Run a contrast checker against the enhanced 7:1 / 4.5:1 thresholds instead of the standard AA ones.

Check any text and background pair with our free WCAG color contrast checker.

Common Failures

• Text passes the standard 4.5:1 AA requirement but falls short of the stricter 7:1 AAA level.

Testing WCAG 1.4.6 With AccessBell

AccessBell's scanner runs axe-core, which includes 1 rule that catch code-level failures of this criterion. Automated checks help you spot issues quickly; a person still needs to review what they cannot judge.

• color-contrast-enhanced: Ensure the contrast between foreground and background colors meets WCAG 2 AAA enhanced contrast ratio thresholds (details (opens in a new tab))

Run a free scan to spot issues on your own pages.

Example Fix

1. Meet the minimum ratios. Body text needs 4.5:1 against its background. Large text (24px, or 19px bold) needs 3:1.
2. Fix the design tokens. Change the color variable in one place so every component that uses it is fixed together.
3. Check every state. Hover, focus, disabled-looking and placeholder text must also be readable.

/* Before: #9aa0a6 on white is 2.6:1 and fails */
.card-meta { color: #9aa0a6; }

/* After: #5b6170 on white is 6.2:1 and passes */
:root { --text-muted: #5b6170; }
.card-meta { color: var(--text-muted); }

/* Text over images: add a solid backing */
.hero-caption {
  color: #fff;
  background: rgb(0 0 0 / 0.7);
}

Related Criteria in Distinguishable

• 1.4.1 Use of Color (Level A, WCAG 2.0)
• 1.4.2 Audio Control (Level A, WCAG 2.0)
• 1.4.3 Contrast (Minimum) (Level AA, WCAG 2.0)
• 1.4.4 Resize Text (Level AA, WCAG 2.0)
• 1.4.5 Images of Text (Level AA, WCAG 2.0)
• 1.4.7 Low or No Background Audio (Level AAA, WCAG 2.0)
• 1.4.8 Visual Presentation (Level AAA, WCAG 2.0)
• 1.4.9 Images of Text (No Exception) (Level AAA, WCAG 2.0)
• 1.4.10 Reflow (Level AA, WCAG 2.1)
• 1.4.11 Non-text Contrast (Level AA, WCAG 2.1)
• 1.4.12 Text Spacing (Level AA, WCAG 2.1)
• 1.4.13 Content on Hover or Focus (Level AA, WCAG 2.1)

Frequently Asked Questions

What does WCAG 1.4.6 require?

AAA only: an enhanced contrast ratio of 7:1 for normal text and 4.5:1 for large text, higher than the AA minimum, for visitors who need stronger contrast.

Can AccessBell test WCAG 1.4.6 automatically?

Yes. AccessBell runs 1 automated rule that can catch failures of this criterion. A person still needs to check what automation cannot judge.

What level is WCAG 1.4.6?

Level AAA, added in WCAG 2.0. Level AAA is the highest, most demanding conformance level in WCAG.

Sources

• W3C: Understanding 1.4.6 Contrast (Enhanced) (opens in a new tab)
• W3C: Web Content Accessibility Guidelines (WCAG) 2.2 (opens in a new tab)

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