- From: Jon Gunderson <jongund@uiuc.edu>
- Date: Mon, 22 Nov 2004 15:28:43 -0600
- To: Will Pearson <will-pearson@tiscali.co.uk>, wai-xtech@w3.org
Will, I updated the draft to include your directional navigation proposal. Sorry I didn't have it in the first draft. http://www.w3.org/WAI/UA/2004-11-wai-comments-svg12.html Jon ---- Original message ---- >Date: Mon, 22 Nov 2004 20:38:55 -0000 >From: "Will Pearson" <will-pearson@tiscali.co.uk> >Subject: Keyboard Navigation For Document Exploration In SVG 1.2 >To: <wai-xtech@w3.org> > > Hi; > > At the moment there's no clear indication within the > spec that document exploration should be made > available through a ua's keyboard interface. Whilst > most people will be able to visually explore the > image, this won't be possible for some users, and > may not be possible for others. Therefore, I would > like to suggest that some form of navigation between > container elements and graphic elements be > recommended as a guideline for ua developers. This > should facilitate exploration of the document away > from any elements with 'focusable' set to true, or > active elements with 'focusable' set to auto. > > Ideally, this would be based on spatial direction, > thus allowing the user to build up a mental model of > the spatial relationships between elements. > > The spec already makes provision for a range of > alternative pointing devices, through DOM 3 I think, > but I think we need something a bit more granular > than a pixel by pixel movement typically offered by > pointing devices. The main reason for this, is that > the HCI task analysis for moving two points require > the user to know where the pointer is in relation to > the target. This can be done with speech, and > there's an event in JAWS to handle this, but having > experimented with this on a small number of users, > doing the math necessary to work out the > relationship between pointer and target raised the > cognitive workload, as measured by the NASA-TLX > test, quite significantly. > > So, I propose the following eight keys to facilitate > document exploration within a ua: > > I. Up (337.5º - > 22.5º) > > II. Diagonally up and > right (22.5º - 67.5º) > > III. Right (67.5º - > 112.5º) > > IV. Diagonally down and > right (112.5º - 157.5º) > > V. Down (157.5º - > 202.5º) > > VI. Diagonally down and > left (202.5º - 247.5º) > > VII. Left (247.5º - > 292.5º) > > VIII. Diagonally left and up > (292.5º - 337.5º) > > > > Each of these keys will be responsible for moving to > the nearest element within a 45º arc, as listed > above. > > Will Jon Gunderson, Ph.D., ATP Coordinator of Assistive Communication and Information Technology Division of Rehabilitation - Education Services MC-574 College of Applied Life Studies 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://cita.rehab.uiuc.edu/ WWW: http://www.staff.uiuc.edu/~jongund
Received on Monday, 22 November 2004 21:28:51 UTC