Section 508 Compliance

HTML Coding Tutorial

Flashing or Flickering Elements

(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: Flashing and moving graphics can also be extremely distracting and just plain annoying to other users.

Flashing or flickering elements are usually added through technologies such as animated gif's, Java applets, or third-party plug-ins or applications.

Importance: Causing a page or elements on a page to flash or flicker can have serious effects on users with epilepsy and light sensitivity.

Bad Example

1.  Using Flashing/Flickering image(s)
Flashing text

Good Example

1.  Get rid of the image completely
Free Underwater Hockey Lessons!

Completely remove the graphic and use marked up text to highlight the importance.

Do-It-Yourself Fixes

The easiest way to comply with section (j) is to completely remove all of the flickering or flashing images the web site has. Instead of using Java applets, plug-ins, and animated gif's, use mark up language to highlight text (e.g. changing font size or color). This is much easier on the eyes and you will not have to worry about setting the correct frequency.