Success Criterion 2.3.1
Conformance level A

Strobe Intro or Glitch Effect Above the Flash Threshold

2.3.1 — Three Flashes or Below Threshold

Scenario

Setting

A ride-hailing app's trip booking screen

What’s wrong

Any content flashing >3 times/second above general or red-flash thresholds: strobe intros, glitch effects, party GIFs.

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 any strobe/glitch visual effect (intro animations, transitions) with PEAT: flashing above the general or red-flash 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 ride-hailing app's trip booking screen, this barrier is gone for people with photosensitive epilepsy and others sensitive to rapid flashing — they can complete the task without hitting this wall.

Who is affected