- From: Simon Harper <simon.harper@manchester.ac.uk>
- Date: Thu, 3 Dec 2009 09:39:44 +0000
- To: UAWG list <w3c-wai-ua@w3.org>
Again, Kim and I had this action, but looking at this I think we should amalgamate these two into: 4.4.1 The user interface never violates the general flash or red flash thresholds, or flashes more than three times in any one second period (Level A) Intent of Success Criterion 4.4.1: The intent of this Success Criterion is to guard against inducing seizures due to photosensitivity, which can occur when there is general flashing, or red flash. A potentially harmful flash occurs when there is a pair of significantly opposing changes in luminance, or irrespective of luminance, a transition to or from a saturated red occurs. Examples of Success Criterion 4.4.1: A single, double, or triple flash -- as long as it does not include changes to or from a saturated red -- may be used to attract a user's attention, or as part of an interface animation. Related Resources for Success Criterion 4.4.1: ITC Guidance Note for Licensees on Flashing Images and Regular Patterns in Television: http://www.ofcom.org.uk/tv/ifi/guidance/ legacy/vrs_code_notes/flsh_imgs/gn_flash.pdf Best Kim and Si.
Received on Thursday, 3 December 2009 09:40:11 UTC