Success Criterion 2.3.1
Conformance level A

Rapid Hover Effect That Flashes When a Key Autorepeats

2.3.1 — Three Flashes or Below Threshold

Scenario

Setting

An insurance company's claims form

What’s wrong

Hover/press effects that rapidly toggle high-contrast states when a key autorepeats.

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

Hold down a key that triggers a rapid hover/press toggle effect (autorepeat): check whether the resulting flicker exceeds the flash threshold.

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 an insurance company's claims form, this barrier is gone for people with photosensitive epilepsy and others sensitive to rapid flashing — they reach the same outcome without extra effort.

Who is affected