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8.14 Level A − WCAG 2.0 Success Criterion 2.3.1 − Three Flashes or Below Threshold

Ensure all flashing items are dimmed, and cover only a small area of the screen or the flash rate is three times per second or less. Otherwise, this may cause problems for people who suffer from epilepsy.

Before Rectification

A webpage sample with an image that contains flashing elements.

In this example, the traffic light image is flashing too fast, and is too bright and covers a large part of the screen. This content can cause seizures in people prone to this problem.

After Rectification

A webpage sample with static content that do not flash.

It is better to replace flashing content with static content, or ensure the object flashes in only a small portion of the screen or the flash rate is less than three times a second.

Link to Live Example for 2.3.1

WCAG 2.0 Reference:

http://www.w3.org/TR/UNDERSTANDING-WCAG20/seizure-does-not-violate.html