- From: Marja-Riitta Koivunen <marja@w3.org>
- Date: Wed, 10 Mar 1999 10:23:16 -0500
- To: w3c-wai-ua@w3.org
- Cc: ian@w3.org
Here is the first draft for 7.3. As you see there are still some questions in the actual SMIL document that need to be clarified. 7.3 SMIL Support accessibility features defined by W3C Recommendations for SMIL. Accessible presentation means here that the information can be easily accessed by using different media and that the user can easily control whether to show the information or not. - Support accessible presentation of "title", "abstract" and "author" attributes defined for SMIL synchronization elements. - Support accessible presentation of "alt", "londesc", "title", "abstract" and "author" attributes defined for SMIL media object elements. !!The relationships between abstract and longdesc and alt should be clarified. - Support an interface for turning captions on and off. Captions are defined either by using "system-overdub-or-caption" attribute with value "caption" or "system-captions" attribute with value "on". If "system-captions" attribute has value "off" then what? !!The captions are never shown? The captions are not shown initially? Or should this just be deprecated and if really needed use stylesheets with display=none? Overall, this is not very intuitive. - Support an interface for turning overdubs on and off. Overdubs are defined by using "system-overdub-or-caption" attribute with value "overdub". - When captions are shown support a caption region. According to user preferences this could be embedded in the SMIL layout or shown in a separate window. - When user prefers to, support a stable, time independent view to the links so that time dependent links can be easily searched. - Offer a way to change system values affecting to "system-bitrate", "system-screen-size" and "system-depth" attributes since these can have an affect to the user interface. In addition, give feedback of the values in a form that list only those selections that can have an effect to the user interface. For instance, if the SMIL author has defined three different user interfaces for bitrates below 1200, between 1200 and 2400, and over 24000 the user should be given a selection of these three choices not just any bitrate number. !!Another thing is how good it is to hardwire these UI choices to the actual SMIL code and what choices need to be hardwired. It should be possible to easily define UI changes tailored for different devices and systems also later.
Received on Wednesday, 10 March 1999 10:21:46 UTC