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

.alert-badge { animation: flash 0.2s infinite; } /* 5Hz */

Why it matters

People with photosensitive epilepsy and others sensitive to rapid flashing.

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

Nothing may flash more than 3 times per second above the general or red-flash thresholds. .alert-badge { animation: flash 1s infinite; } /* below 3Hz threshold */ Content must not flash more than 3 times per second across a large enough area to matter.

Outcome

On a pharmacy app's prescription-refill form, this barrier is gone for people with photosensitive epilepsy and others sensitive to rapid flashing — they get the same result as anyone else here.

Who is affected