proposed response to HTML5 Accessibility Taskforce

The User Agent Working Group was asked to review the following bugs by John
Foliot on Jan 31.  Our response follows each bug.

https://www.w3.org/Bugs/Public/show_bug.cgi?id=10841
We require a method to allow the user to control playback timing in order
to have more time to understand the material.
recommend: close
UAAG20 has this covered, we consider media players that are plugins to be
User Agents. If the UA is playing the media natively, then it is the UA's
responsibility to provide this functionality.
2.11.5 Playback Rate Adjustment for Prerecorded Content:

The user can adjust the playback rate of prerecorded time-based media
content, such that all of the following are true: (Level A)

a.    The user can adjust the playback rate of the time-based media tracks
to between 50% and 250% of real time.
b.     Speech whose playback rate has been adjusted by the user maintains
pitch in order to limit degradation of the speech quality.
c.     Audio and video tracks remain synchronized across this required
range of playback rates.
d.     The user agent provides a function that resets the playback rate to
normal (100%).
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https://www.w3.org/Bugs/Public/show_bug.cgi?id=10842
Support the isolation of speech from other background sounds in AV media
reccomend: close
UAAG20 had this at one time, then removed it as it was technically too
difficult.
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https://www.w3.org/Bugs/Public/show_bug.cgi?id=10843
Support user control over the visual presentation of caption text.
Recommend: close
UAAG20 has this covered
 1.1.3 Display of Time-Based Media Alternatives:

For recognized on-screen alternatives for time-based media (e.g. captions,
sign language video), the following are all true: (Level AA)## DONE 2
August 2012

a.    Do not obscure primary media: The user can specify that displaying
media alternatives doesn't obscure the primary time-based media; and
b.    Do not obscure controls: The user can specify that the displaying
media alternatives doesn't obscure recognized controls for the primary
time-based media; and
c.    Configurable text: The user can configure recognized text within
media alternatives (e.g. captions) in conformance with 1.4.1.

Note: Depending on the screen area available, the display of the primary
time-based media may need to be reduced in size to meet this requirement.

1.1.4 Default Rendering of Alternative Content (Enhanced):

For each type of non-text content, the user can specify the cascade order
in which to render different types of alternative content when preferred
types are not present. (Level AAA) ## DONE 28 March 2012

1.1.5 Size and Position of Time-Based Media Alternatives:

The user can configure recognized on-screen alternatives for time-based
media (e.g. captions, sign language video) as follows: (Level AAA)

a.    The user can resize the media alternatives up to the size of the user
agent's viewport.
b.    The user can reposition the media alternatives to at least above,
below, to the right, to the left, and overlapping the primary time-based
media.

Note 1: Depending on the screen area available, the display of the primary
time-based media may need to be reduced in size or hidden to meet this
requirement.

Note 2: Implementation may involve displaying media alternatives in a
separate window, but this is not required.

-- 
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