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Re: TAG Horizontal review of TTML2

From: Pierre-Anthony Lemieux <pal@sandflow.com>
Date: Wed, 26 Jul 2017 16:37:12 -0700
Message-ID: <CAF_7JxAh8U-XYB9aLZW-FSNBh3f9dtuGxvDskvva=VXditgenw@mail.gmail.com>
To: Nigel Megitt <nigel.megitt@bbc.co.uk>
Cc: Timed Text Working Group <public-tt@w3.org>
Hi Nigel,

> TAG agrees that the styling features/requirements of subtitles and captions need to be in CSS.
> [...] request to begin work on meeting subtitle and caption presentation requirements in CSS, prior
>  to following up at our meeting in TPAC later in the year (to which I will invite CSSWG as previously agreed).

Thanks for the report. Very encouraging news.

Was there any delta to the gap analysis you provided?

Best,

-- Pierre

On Wed, Jul 26, 2017 at 9:08 AM, Nigel Megitt <nigel.megitt@bbc.co.uk> wrote:
> This morning I was invited to attend TAG who were meeting in London, to
> discuss TTML2 as part of the horizontal review.
>
> The draft (in progress) minutes are at
> https://pad.w3ctag.org/p/2017-07-26-minutes.md and will be finalised on
> https://github.com/w3ctag/meetings/tree/gh-pages/2017/07-london at some
> point in the future (they will be "day 2").
>
> Here's my unofficial broad summary of the discussion and the conclusions:
>
> TAG considers that CSS is the future for styling and recommends that where
> possible TTML styling attributes define their semantics on the equivalent
> CSS properties, potentially alongside the XSL-FO semantics if they are the
> same, or I guess at least highlight the differences if they exist. The view
> is that one day, we will have to, so it is cheaper to do it now than later.
> I explained a little of the history why TTML references XSL-FO.
> I explained that I do not think that TTWG is concerned about syntactic
> differences, but semantic differences are a potential problem.
> There's a possibility that CSS semantics currently aligned with XSL-FO might
> in the future diverge.
> CSS whitespace handling is being looked at actively – we're not the only
> ones to have problems with it.
> It is deemed acceptable to move a spec to Rec if it normatively references
> other specs that are in Candidate Rec.
> CSS publishes roughly annually a snapshot of the current specs that are
> considered to be stable. This could be used as the basis for any references.
> There was a bit of discussion about the basis in XML and XML's future, with
> no conclusion.
> There was some question of whether TTML is the best place to put
> stereoscopic disparity of text; I argued strongly that it has to be in there
> if it is to be useful.
> Regarding TextTrackCue not being instantiatable directly in most browsers,
> the suggestion is to discuss with HTML WG and possibly raise issues against
> individual browser implementations.
> TAG agrees that the styling features/requirements of subtitles and captions
> need to be in CSS.
> There's a CSS WG face to face meeting in Paris next week – if possible I
> will join remotely for the agenda item on TTML2 HR and request to begin work
> on meeting subtitle and caption presentation requirements in CSS, prior to
> following up at our meeting in TPAC later in the year (to which I will
> invite CSSWG as previously agreed).
>
> Kind regards,
>
> Nigel
>
>
>
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Received on Wednesday, 26 July 2017 23:37:57 UTC

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