guideline: Seizures and Physical Reactions
Prevent content from triggering seizures or adverse reactions.
WCAG 2.0, 2.1, 2.2
Level A
2.3.1 Three Flashes or Below Threshold
Content must not flash, blink, or flicker more than three times per second, unless it stays within safety limits designed to avoid visual overload and reduce the risk of seizures.
WCAG 2.0, 2.1, 2.2
Level AAA
2.3.2 Three Flashes
Content must not flash, blink, or flicker more than three times per second (no exception, not even if it meets safety thresholds).
WCAG 2.1, 2.2
Level AAA
2.3.3 Animation from Interactions
Animations triggered by interaction (e.g. on click, hover, tap) must be able to be disabled through system settings (e.g. “reduce motion”), or turned off using a site-level option.
