2.3.2 Three Flashes (Level AAA): WCAG explained. Axevoo

In plain English

Rapid flashing can trigger seizures in people with photosensitive epilepsy. The Level A rule (2.3.1) allows fast flashing only if it is small or dim enough to be safe. This AAA rule is simpler and stricter: nothing flashes more than three times a second, period, no matter how small or faint.

Most stores have nothing that flashes, so they pass without effort. The thing to watch is a strobing promo GIF or a video with a flashing effect.

Who this is for

People with photosensitive epilepsy, for whom fast flashing is a real medical risk.

How to check and fix it yourself

Scan for anything that flashes or strobes: animated banners, GIFs, video effects. If anything flashes more than three times a second, slow it down or remove the effect.

Static or gently animated banners.            ✓
A GIF strobing rapidly in the header.         ✗ remove or slow it
Video with a strobe sequence.                 ✗ re-edit or replace

Where we can help

We look for flashing and strobing content across your store and flag anything that could cross the safety line. It is rare, but the consequences are serious enough that it belongs on any thorough review.

Frequently asked questions

What does three flashes require?+

Success Criterion 2.3.2 (Level AAA) says nothing on the page may flash more than three times in any one-second period, with no exceptions for the size or brightness of the flash.

How is it different from 2.3.1?+

2.3.1 Three Flashes or Below Threshold (Level A) allows fast flashing if it's small enough or dim enough to stay under a defined safety threshold. 2.3.2 (AAA) removes that allowance entirely: nothing flashes more than three times a second, regardless.

Does a typical store need to worry about this?+

Most stores have no rapid flashing at all, so they meet it by default. The risk comes from flashy promo GIFs, video with strobe effects, or an aggressive animated banner. Keep anything that flashes to three times a second or fewer.

Three Flashes