2.3 Seizures and Physical Reactions · Operable
WCAG 2.3.1 Three Flashes or Below Threshold
Level A
No part of the page should flash more than three times per second, unless the flash is small and below the WCAG general/red flash thresholds.
Common failures
- Promotional GIFs flash brand colours rapidly.
- Loading spinners pulse aggressively.
How to fix
- Audit animated assets for flash rate; soften any above 3 Hz.
- Use the PEAT photosensitive epilepsy analyser on suspect content.
Related criteria
- WCAG 2.3.2 Three Flashes Level AAA