WCAG 2.3.1 requires that web content does not contain anything that flashes more than three times per second, unless the flash is below general or red flash thresholds. This criterion is critical for preventing seizures and physical reactions in users with photosensitive epilepsy or similar neurological conditions.

WCAG 2.3.1: Three Flashes or Below Threshold

WCAG 2.3.2 requires that web pages contain no content that flashes more than three times in any one-second period, with no exception for small or low-contrast flashes. This stricter AAA criterion protects users with photosensitive epilepsy and other seizure disorders from potentially life-threatening neurological reactions.

Flashing Content

WCAG 2.3.1: Three Flashes or Below Threshold

WCAG 2.3.2: Three Flashes