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Level AAA − WCAG 2.0 Success Criterion 2.3.2 − Three Flashes

Ensure there is nothing on a website that "flashes" for more than three times per second irrespective of its size. Otherwise, this may cause problems for people who suffer from epilepsy.

Before Rectification

A webpage sample containing a rapid flashing animation.

In this example, the traffic light image is flashing too fast and is large in size. This can cause seizures.

After Rectification

A webpage sample containing static elements that do not flash.

It is better to replace flashing content with static content that does not change.

WCAG 2.0 Reference:

http://www.w3.org/TR/UNDERSTANDING-WCAG20/seizure-three-times.html