[whatwg] Apple Proposal for Timed Media Elements

Dave Raggett dsr at w3.org
Thu Mar 22 06:32:49 PDT 2007

If we leave control of captioning to the user agent, this would 
appear to necessitate related accessibility conformance requirements 
on the UA.

  Dave Raggett <dsr at w3.org> http://www.w3.org/People/Raggett

On Thu, 22 Mar 2007, Maciej Stachowiak wrote:

> On Mar 22, 2007, at 2:09 AM, Dave Raggett wrote:
>> From an accessibility perspective the proposal lacks support for 
>> captioning. There should be a mechanism for enabling/disabling captions to 
>> avoid disadvantaging people who have difficulties with hearing the audio. 
>> It should further be possible to control the font size for captions to 
>> avoid disadvantaging people who don't find small font sizes intelligible. I 
>> don't think that the Web Accessibility folks will find the fall back text 
>> to be a compelling solution, and it is no longer acceptable to ignore 
>> accessibility.
> Video can have timed text tracks, but we haven't yet proposed an API for 
> controlling that other than a vague suggestion in open issues. Accessibility 
> features in the UA itself could still allow global control of caption tracks 
> per this spec.
>> p.s. the step function refers to frames but I was unable to find out 
>> whether the interface provides the current frame rate. This would appear to 
>> be an oversight.
> The omission of frame rate is deliberate, since in many modern media formats 
> frames are not a fixed duration. But even without defining a rate, it may 
> still be possible to single-step frames and can be interesting for close 
> inspection of video, either for video professional purposes or things like 
> finding single-frame easter eggs.
> Regards,
> Maciej

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