Photosensitive epilepsy (seizures triggered by sudden changes in luminescence) doesn't affect too many people, but it's an awful condition and sooner or later one of your users will have it. The general rule here is "no more than 3 flashes per second." [1]
You probably don't have a good design reason to use strobe lights anyway. Slow those .gifs down, please.
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You've had a seizure induced by an animated gif? That is nasty.
Photosensitive epilepsy (seizures triggered by sudden changes in luminescence) doesn't affect too many people, but it's an awful condition and sooner or later one of your users will have it. The general rule here is "no more than 3 flashes per second." [1]
You probably don't have a good design reason to use strobe lights anyway. Slow those .gifs down, please.
[1] http://www.w3.org/TR/UNDERSTANDING-WCAG20/seizure.html
The Military maintains MIL-STD-1472 which contains the duty cycle for flashing text. Here's an interesting (and occasionally submitted) discussion on jzw's blog: http://www.jwz.org/blog/2013/08/a-light-has-gone-out-on-the-...