- From: Jim Allan <jimallan@tsbvi.edu>
- Date: Thu, 28 Oct 2010 12:01:01 -0500
- To: WAI-ua <w3c-wai-ua@w3.org>
ACTION-460 jallan to review CC2,3,4 cc2 allow erasures, i.e. times when no text cues are active cc3 allow gap-less cues summary of discussion: It seems to me that these are also covered by our requirement that UA implement technologies as spec'd: if the spec allows these features, the UA has to support them. That is, 1.4.1 Follow Specifications: Render content according to the technology specification. This includes any accessibility features of the technology (see Guideline 1.3). (Level A) no difference in gap-less presentation and erasures as far as markup is concerned. the gap-less or erasures is handled by the player. caption playback presentation is akin to internal UA stylesheet (that up until recently user was not able to change)(it is currently present and operable, but the author/user cannot change the playback presentation) use case, users who are slow readers will need gap-less presentation. overriding erasures in the player implementations - can/may be created by last call define default rendering style (gap-less or erasures). 3.1.2 Configurable Default Rendering (at least the title) may fit better in 4.9, create new SC or modify 3.1.4 second sentence "If the alternative content has a different height or width, the user agent will reflow the viewport." could become "If the alternative content has a different height or width, the user agent will reflow the viewport; if the alternative content has a longer duration, the user can have the user agent pause the primary content to allow the alternative content to..." ? Mark brings up idea that the user may want to have captions pause until the user can finish reading them (e.g. slow braille reader or slow visual reader). smil - pauses at the end of each caption element, so braille reader can say continue after reading is complete playback runs until caption appears, then auto-pauses until user signals that playback shoudl resume. persistence of transient events (hyper links, gapless), have an event persist until something replaces it. or the window to respond to a prompt use examples for slow reader, gapless presentation, braille reader pause after caption describes scrolling list of captions (5+ seconds) at CSUN Proposal NEW SC 4.9.12 Persistence of time-based media content. The UA should provide a mechanism to allow time-based content to persist beyond the author-specified duration. (AA or AAA) Intent of Success Criterion 4.9.12: During playback of time-based media, some content, such as captions or hyperlinked hotspots, may appear and disappear along the authored timeline. Users, for example those with visual or learning disabilities, may require additional time to read or interact with the content which exceeds the authored presentation time. The UA should provide a mechanism that allows the user extend the presentation duration of time-based content so that it persists beyond the authored time interval. notes for examples gap-less. authored timeline - caption appears from 1-3 seconds, another caption does not appear until 4 seconds. normally, the caption would disappear for one second. The user can specify through some setting that the caption stays on the screen until the next caption replaces it. ex 1 gapless captions, ex 2 transient hyperlinks, ex 3 scrolling transcript ex 4, paused caption presentation 2. hyperlinks would persist until next caption (gapless) to give time to click hyperlink allowing the user as much time as they need to read a screen of captions, before they manually unpause. -- Jim Allan, Accessibility Coordinator & Webmaster Texas School for the Blind and Visually Impaired 1100 W. 45th St., Austin, Texas 78756 voice 512.206.9315 fax: 512.206.9264 http://www.tsbvi.edu/ "We shape our tools and thereafter our tools shape us." McLuhan, 1964
Received on Thursday, 28 October 2010 17:01:39 UTC