Operable
2.3.1 Three Flashes or Below Threshold
Nothing can flash more than three times in any one second, unless the flashes stay below set size and brightness limits.
Who it helps
People with photosensitive epilepsy.
Failures we see most
- Strobing video intros
- Flashing sale banners
How it gets tested
No automated tool can judge 2.3.1 reliably, so a specialist tests it by hand, with a keyboard and a screen reader where that applies.
How we fix it
A specialist fixes this in your site's code or content, and we re-test the page before you sign off.
Official text: W3C, Understanding 2.3.1 Three Flashes or Below Threshold. Checks listed from axe-core 4.14.0.
Does your site fail 2.3.1?
Our free scan checks up to 50 of your pages and tells you which criteria fail and where.