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J.  Pages shall be designed to avoid causing the screen to flicker with a frequency greater than 2 Hz and lower than 55 Hz.

Explanation:

Avoid using the BLINK and MARQUEE elements. Use another method, such as text size, to draw attention to the text. Text coded to BLINK or MARQUEE is not readable by screen readers. Also text displayed this way can be difficult to understand by users with learning disabilities. Furthermore, as is stated in the World Wide Web Consortium guidelines on accessibility, people with photosensitive epilepsy can have seizures triggered by flickering or flashing in the 2 to 55 flashes per second (Hertz) range with a peak sensitivity at 20 flashes per second as well as quick changes from dark to light (like strobe lights).


Back to Creating Accessible Web Sites
 

Campus Web Office
5761 Public Affairs Building
Orono, ME 04469-5761
Phone: (207) 581-3744 | Fax: (207) 581-3534
E-mail: umweb@umit.maine.edu

The University of Maine
, Orono, Maine 04469
207-581-1110
A Member of the University of Maine System