This Web accessibility tutorial demonstrates how to avoid flashing, flickering, blinking or staggered movement from a control like a marquee or animated gif.
Some individuals with photosensitive epilepsy could suffer a seizure triggered by displays that flicker, flash, or blink, particularly if the flash has a high intensity and is within certain frequency ranges.
Please visit:
http://www.calstatela.edu/sites/defau...
for the step by step guide
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