W3C home > Mailing lists > Public > public-texttracks@w3.org > September 2012

Re: Yet Another Scroll-Up Idea (YASUI) in VTT

From: David Singer <singer@apple.com>
Date: Tue, 25 Sep 2012 09:42:53 -0700
Message-id: <E243321F-3F19-40F1-B175-C852B423A0C6@apple.com>
To: public-texttracks <public-texttracks@w3.org>
[catching up, sorry]

On Sep 20, 2012, at 18:15 , Silvia Pfeiffer <silviapfeiffer1@gmail.com> wrote:

>> We wanted to make sure that CSS was optional and that coloring windows was possible.  Silvia has a blog started on mapping 6/708 to VTT, and in there she suggests that UAs be able to behave 'as if' a 708 style sheet were available.  We don't want two windows with the same ID but we might want two with the same color, so that suggested that the class name should be possible. (It might be good to allow zero or more class names, in fact, if we want to be able to talk about border, shadow, etc. as separate 'CSS' classes.)
> I think if we wanted classes on cues or regions, we'd have to solve
> that more generally. I don't actually think we need class names on
> regions.

I don't know how to enable setting regions, while enabling but not requiring, CSS, in any other way, but it sounds like you have an idea.

On Sep 21, 2012, at 2:02 , Silvia Pfeiffer <silviapfeiffer1@gmail.com> wrote:

>> Are offline players not willing to implement support for the CSS subset that
>> applies to WebVTT?
> I can't answer that question, since I can't speak for offline players.
> I do know that I got push-back at VDD. Maybe JB has more to say on
> this.

We just posted <http://tools.ietf.org/html/draft-pantos-http-live-streaming-09> where we document VTT support in HTTP Live Streaming, and no, we don't require any kind of CSS support in an HLS client (and would prefer it to remain that way).  Nor do we have access to CSS in our current client, as far as I know.

On Sep 21, 2012, at 3:08 , Simon Pieters <simonp@opera.com> wrote:

> I'm getting mixed messages. On the one hand, you say that players should support the full spec. On the other hand, the style sheet is only for Web browsers?

I think that the full spec. should enable use of CSS when it's offered by the author and supported by the client, but not require it.  I also think that some UAs can behave 'as if' they have a CSS style sheet built-in (e.g. one supporting 608/708 features).

David Singer
Multimedia and Software Standards, Apple Inc.
Received on Tuesday, 25 September 2012 16:43:23 UTC

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