The Three-Flash Threshold for Seizures
Keep flashing content within safe limits.
Flashing Can Harm
For some people, flashing light on a screen can trigger a seizure. This is one place where an animation choice becomes a safety choice. ⚠️
Photosensitive Epilepsy
The risk has a name: photosensitive epilepsy. Bright, rapid flashes are the classic trigger for people who live with it.
All lessons in this course
- prefers-reduced-motion in CSS and JS
- Vestibular Disorders and Parallax Risks
- The Three-Flash Threshold for Seizures
- Pause, Stop, Hide for Auto-Moving Content