This document is a draft, and is designed to show changes from a previous version. It is presently showing added text,changed text,deleted text,[start]/[end] markers,and Issue Numbers.
Changes are displayed as follows:
Applies to any technology
This technique relates to:
The purpose of this technique is to allow people who have photosensitive seizures to view Web sites without encountering material that is likely to cause a seizure. Warnings can be provided but people may miss them and children may not be able to read or understand them. With this technique all material is checked and if it violates flash or red flash thresholds it is either not put on the site or it is modified so that it does not violate the thresholds.
An animation of a thunderstorm shows six flashes of lightning. The flashes are so fast that the general flash threshold is violated. The animation is modified to create a short pause after each pair of lightning flashes. After the changes are made, the animation does not violate the general flash threshold.
Resources are for information purposes only, no endorsement implied.
(none currently listed)
Check to see to see that content does not violate the general flash and/or red flash threshold
determine (with or without instruments) that there are no more than three flashes (6 transitions) of any kind in any one second period
Note: If there are three flashes, check that the Light/Dark status at the end of the 1-second period is the same as at the start.
OR
determine that flashing is greater than 50 hz OR
use a tool that to determine that neither the General Flash nor Red Flash threshold were exceeded
Any one of the steps above is true