2.3 Guideline revisions proposal

2.3 deals with content that can content that can cause seizures. 

 

We decided to not create or lift specifications but rather to require that
existing standards be followed.

 

To do this we would need to 

 

1)       Remove the word international from the success criteria.

2)       Shorten the definitions to descriptive rather than quantitative
definitions of the key terms in the success criteria. 

3)       Remove the inadvertent reference to 'red flash' in the L3 success
criteria. 

4)       Clean up definitions to removed all reference to specific
quantitative thresholds. 

 

The resulting guideline and definitions would look like:

 


Guideline 2.3 Allow users to avoid content that could cause seizures due to
photosensitivity.


Level 1 Success Criteria for Guideline 2.3


1.	Content that violates health and safety standards for general flash
<http://www.w3.org/WAI/GL/2005/06/f2f-proposed-resolutions-draft.html#flash-
thresholddef>  or red flash
<http://www.w3.org/WAI/GL/2005/06/f2f-proposed-resolutions-draft.html#red-th
resholddef>  is marked in a way that the user can avoid its appearance
<http://www.w3.org/WAI/GL/2005/06/f2f-proposed-resolutions-draft.html#marked
priordef> . [V] 


Level 2 Success Criteria for Guideline 2.3 


1.	Content does not violate health and safety standards for general
flash
<http://www.w3.org/WAI/GL/2005/06/f2f-proposed-resolutions-draft.html#flash-
thresholddef>  or red flash
<http://www.w3.org/WAI/GL/2005/06/f2f-proposed-resolutions-draft.html#red-th
resholddef> . [V] 


Level 3 Success Criteria for Guideline 2.3 


1.	Content does not violate health and safety standards for spatial
pattern [V] 

 


Definitions 


general flash 


*         A sequence of flashes or rapidly changing image sequences of any
color 


red flash 


*    A transition to or from a saturated red at any luminance level 


spatial pattern 


A series of pairs of light and dark stripes (straight or curved)

 


marked in a way that the user can avoid its appearance


The content is marked in a fashion that would allow the user to determine
that upcoming material is provocative before the material is presented.
Some methods that might be used for this include:

*         notification on the page before provocative information is
encountered.

*         Notification near a link or embedded media player that would play
provocative material

*         information in the title (so search engine shows it)

*         metadata on the page in a standard format.

 

Editorial Note: This definition needs work.

 


Gregg

------------------------

Gregg C Vanderheiden Ph.D. 
Professor - Depts of Ind. Engr. & BioMed Engr.
Director - Trace R & D Center 
University of Wisconsin-Madison 
< <http://trace.wisc.edu/> http://trace.wisc.edu/> FAX 608/262-8848  
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