- Success Criterion 2.3.1
- Conformance level A
Unedited Video With Strobe or Lightning Effects
2.3.1 — Three Flashes or Below Threshold
Scenario
Setting
A pharmacy app's prescription-refill form
What’s wrong
Video content with lightning/strobe sequences unedited and above threshold at typical viewing size.
Example
<video autoplay src="pharmacy-promo.mp4"></video>
<!-- unedited stock footage includes a strobe lightning sequence -->Why it matters
A patient submitting a refill request is exposed to unedited lightning-strobe footage with no warning before it plays.
How to test
Review video content with lightning/strobe sequences through PEAT at the size it's typically viewed: unedited footage above threshold fails.
How to fix
Replace unscreened stock footage with static imagery, or re-edit it below the flash threshold.
<img src="pharmacy-promo-still.jpg" alt="Pharmacy team ready to help with your refill">Outcome
A patient completes their refill request without any strobing video playing nearby.
Who is affected
Patients with photosensitive epilepsy risk a seizure trigger from footage that was never checked against the flash threshold.
Learn more
- Understanding Understanding document (opens in a new tab)
Related scenarios
- Content Flashing Faster Than 3 Times per Second
- Strobe Intro or Glitch Effect Above the Flash Threshold
- Rapid Full-Screen Color Flash on Load or Error
- Ad or User-Generated Content Never Screened for Flashing
- Rapid Hover Effect That Flashes When a Key Autorepeats
- Loading Spinner Built as a Rapid Full-Screen Flicker