- Success Criterion 1.4.3
- Conformance level AA
Text Overlaid on Video With Contrast That Drops Too Low
1.4.3 — Contrast (Minimum)
Scenario
Setting
A community forum's discussion thread
What’s wrong
Text over video backgrounds with frames that drop contrast.
Example
Here's what happens on a community forum's discussion thread: text over video backgrounds with frames that drop contrast.
Why it matters
Low-vision and older readers, plus anyone viewing a dim or sunlit screen. In this case (a community forum's discussion thread), they can't read the text against its background.
How to test
Measure text overlaid on a video background at a representative frame: if it drops below ratio during any part of playback, it fails.
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).
Outcome
Once corrected, a community forum's discussion thread lets them tell the information apart without relying on color, specifically for the “Text Overlaid on Video With Contrast That Drops Too Low” issue on a community forum's discussion thread.
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
- Large Heading Text That Still Falls Below 3:1 Contrast
- Placeholder Text With Contrast Too Low to Read Easily
- Text on a Gradient Background Dropping Below Contrast Ratio