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WCAG · Level A

WCAG 2.3.1 – Three Flashes or Below Threshold

Content does not flash more than three times per second or stays below safe thresholds.

View official specification

At a glance

Impact level Medium
Topics
Flashing content Seizure risk Animations
Who this affects
Users with photosensitive epilepsy Users with vestibular disorders

Why this matters

Flashing content can trigger seizures and other physical reactions.

Implementation Guide