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Re: TAG Horizontal review of TTML2

From: Nigel Megitt <nigel.megitt@bbc.co.uk>
Date: Thu, 27 Jul 2017 13:45:52 +0000
To: Pierre-Anthony Lemieux <pal@sandflow.com>
CC: Timed Text Working Group <public-tt@w3.org>
Message-ID: <D59FACD0.4534A%nigel.megitt@bbc.co.uk>
Hi Pierre,

> Was there any delta to the gap analysis you provided?

Not really, though possibly it wasn't the right forum for an in-depth
analysis. Aside from the discussion of disparity, there was mention that
CSS animations exist and are getting better, which might be a point to
note regarding the continuous animation additions.

Kind regards,


On 27/07/2017, 00:37, "Pierre-Anthony Lemieux" <pal@sandflow.com> wrote:

>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?
>-- Pierre
>On Wed, Jul 26, 2017 at 9:08 AM, Nigel Megitt <nigel.megitt@bbc.co.uk>
>> 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
>> TAG considers that CSS is the future for styling and recommends that
>> possible TTML styling attributes define their semantics on the
>> CSS properties, potentially alongside the XSL-FO semantics if they are
>> same, or I guess at least highlight the differences if they exist. The
>> is that one day, we will have to, so it is cheaper to do it now than
>> 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
>> 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
>> 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
>> There was a bit of discussion about the basis in XML and XML's future,
>> 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
>> if it is to be useful.
>> Regarding TextTrackCue not being instantiatable directly in most
>> the suggestion is to discuss with HTML WG and possibly raise issues
>> individual browser implementations.
>> TAG agrees that the styling features/requirements of subtitles and
>> 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
>> on meeting subtitle and caption presentation requirements in CSS, prior
>> 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 Thursday, 27 July 2017 13:51:41 UTC

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