- Success Criterion 1.4.3
- Conformance level AA
Large Heading Text That Still Falls Below 3:1 Contrast
1.4.3 — Contrast (Minimum)
Scenario
Setting
A university's online course catalog
What’s wrong
Large text (≥24px / ≥18.66px bold) below 3:1.
Example
color: #999999; background: #ffffff; /* 2.85:1 */Why it matters
Low-vision and older readers, plus anyone viewing a dim or sunlit screen.
How to test
Measure text at or above 24px (or 18.66px/14pt bold) against its background: it needs at least 3:1.
How to fix
The text must meet at least 4.5:1 contrast (3:1 for large text) against its actual background in every state (default, hover, focus, selected). color: #595959; background: #ffffff; /* 7:1 */ Normal text needs at least 4.5:1 contrast against its background; large text needs at least 3:1.
Outcome
On a university's online course catalog, this barrier is gone for low-vision and older readers — they no longer have to work around this.
Who is affected
Low-vision and older readers, plus anyone viewing a dim or sunlit screen.
Learn more
- Understanding Understanding document (opens in a new tab)
Related scenarios
- Text Color Set Without a Matching Background Color
- Text Placed Directly Over a Photo With No Solid Backing
- Body Text Contrast That Falls Below the 4.5:1 Minimum
- Placeholder Text With Contrast Too Low to Read Easily
- Text on a Gradient Background Dropping Below Contrast Ratio
- Semi-Transparent Text That Fails the Contrast Minimum