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Why This is Important
Flashing lights can induce seizures for people with epilepsy. Avoiding them reduces the chance of a medical emergency.
Flashing lights can also cause pain or discomfort for people who are sensitive to light or be distracting to people with ADHD, Autism, or other cognitive disorders. This includes sirens, strobe lights, and other visual flashing effects.
How to Implement This
Do not use flashing lights
According to WCAG, this refers to any lights that flash more than 3 times per second. Red lights are particularly triggering and should be avoided.
Learn more from the Epilepsy Society.
Provide a content warning
If displaying flashing lights is unavoidable, e.g. if it's video recording of an art installation or a concert performance, provide a content warning that is highly noticeable and allows for the user to exit or close the potentially triggering content.
Most social media platforms automatically play videos and do not include a way to add warning on the platform. If the video includes flashing lights, I recommend adding a 5-second title slide to the beginning of the video as well as a warning in the caption.
Interesting further reading
How to Test This
Manually go through the content and see if there are any flashing lights that could be potentially triggering (lights should not pose any harm to the tester).
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