- From: Jon Gunderson <jongund@staff.uiuc.edu>
- Date: Wed, 22 Sep 1999 15:30:07 -0700
- To: Ian Jacobs <ij@w3.org>, w3c-wai-ua@w3.org
I like the new preamble to the list of when a checkpoint applies. I think the new list is more comprehensive. Jon At 12:02 PM 9/22/99 -0400, Ian Jacobs wrote: >Hello, > >In the 27 August draft [1], applicable checkpoint is defined >as follows: > ><BLOCKQUOTE> >A checkpoint applies to a user agent unless: > a > * The checkpoint definition states explicitly that > it only applies to a different class of user agent. > > * The checkpoint addresses a content type (script, > image, video, sound, applets, etc.) > that the user agent does not recognize. > > * The checkpoint refers to a content type that the user > agent recognizes but does not support natively. > > * The checkpoint refers to the properties of an > embedded object (e.g., video or animation rate) > that may not be controlled or accessed by the user agent. ></BLOCKQUOTE> > >I would like to change this definition as follows: > > The spirit of these guidelines is the following: > If a user agent offers a functionality, it must > ensure that all users have access to that > functionality or an equivalent alternative. Thus, > if the user agent supports keyboard input, it must > support accessible keyboard input. If the user > agent supports images, it must ensure access to each image > or an alternative equivalent supplied by the author. > If a user agent supports style sheets, it must > implement the accessibility features of the style > sheet language. If the user agent supports > frames, it must ensure access to frame > alternatives supplied by the author. > > Not all user agents support every content > type, markup language feature, input or output > device interface, etc. When a content type, feature, or > device interface is not supported, checkpoints with requirements > related to it do not apply to the user agent. Thus, > if a user agent supports style sheets at all, > all checkpoints related to style sheet accessibility apply. > If a user agent does not support style sheets at all, > the checkpoints do not apply. > > The applicability of checkpoints related to > markup language features is measured > similarly. If a user agent supports tables, it must > support the accessibility features of the language > related to tables (or images, or frames, or video, or > links, etc.). The Techniques Document includes information > about the accessibility features of W3C languages such as HTML, > CSS, and SMIL. > > The following summarizes criteria for applicability. > A checkpoint applies to a user agent unless: > > * The checkpoint definition states explicitly that > it only applies to a different class of user agent. > > * The checkpoint includes requirements about > a content type (script, image, video, sound, > applets, etc.) that the user agent does not > recognize at all. > > * The checkpoint includes requirements about > a content type that the user > agent recognizes but does not support natively. > > * The checkpoint refers to the properties of an > embedded object (e.g., video or animation rate) > that may not be controlled or accessed by the user agent. > > * The checkpoint includes requirements about an > unsupported markup language or other technology > (e.g., style sheets, mathematical markup language, > synchronized multimedia, metadata description language, etc.) > > * The checkpoint refers to an unsupported > input or output device interface. Note that if the > interface is supported at all, it must be > supported accessibly. > > - Ian > > >[1] http://www.w3.org/WAI/UA/WAI-USERAGENT-19990827 >-- >Ian Jacobs (jacobs@w3.org) http://www.w3.org/People/Jacobs >Tel/Fax: +1 212 684-1814 >Cell: +1 917 450-8783 Jon Gunderson, Ph.D., ATP Coordinator of Assistive Communication and Information Technology Chair, W3C WAI User Agent Working Group Division of Rehabilitation - Education Services University of Illinois at Urbana/Champaign 1207 S. Oak Street Champaign, IL 61820 Voice: 217-244-5870 Fax: 217-333-0248 E-mail: jongund@uiuc.edu WWW: http://www.staff.uiuc.edu/~jongund http://www.w3.org/wai/ua http://www.als.uiuc.edu/InfoTechAccess
Received on Wednesday, 22 September 1999 16:25:26 UTC