- From: Eric Carlson <eric.carlson@apple.com>
- Date: Thu, 18 Feb 2010 21:49:57 -0800
- To: David Singer <singer@apple.com>
- Cc: Silvia Pfeiffer <silviapfeiffer1@gmail.com>, philipj@opera.com, Geoff Freed <geoff_freed@wgbh.org>, HTML Accessibility Task Force <public-html-a11y@w3.org>
On Feb 18, 2010, at 3:24 PM, David Singer wrote:
>
> It seems to be that if a trackgroup represents an optional feature (e.g. "captions"), then
>
> a) the expression that says whether the trackgroup as a whole is wanted or not, should be, well, at the trackgroup level (a media query)
> b) *which* of the trackgroup you want should be expressed by attributes on the enclosed tracks.
>
> Do we need something at the trackgroup level that gives me a clue what criteria to use to select between the tracks? ("These differ by language", "These differ by mime type") or do we have a rule that is like <source> ... walk down the group and enable the first that seems supportable (and implicitly disable the rest)? I am kinda not keen on 'best match' specifications (but they are hard to avoid when talking about languages).
>
I am in favor of using the same model we have with <source> - the content author "describes" each alternate with attributes and the UA picks the first one that is appropriate for the user's preferences and machine environment.
eric
Received on Friday, 19 February 2010 05:50:33 UTC