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Re: TTML2 wide review comment: styling

From: David Ronca <dronca@netflix.com>
Date: Sat, 30 Sep 2017 18:01:27 -0700
Message-ID: <CAMjV-FijZ6zgKyv03i3KfLsV9A66mLSbRCp3WOprnDYyHpVTmA@mail.gmail.com>
To: David Singer <singer@apple.com>
Cc: Timed Text Working Group <public-tt@w3.org>
> Please consider adopting CSS as-is, without embellishment or improvement.

CSS is beyond the scope of TTML2, and would be a requirement for
TTMLvNext.  Once of the deliverables for IMSCvNext will be a node.js
TTML->CSS transform implementation that will preserve as much of the TTML
styling as possible.  This will simplify IMSCvNext rendering for HTML
clients.

On Sat, Sep 30, 2017 at 5:49 PM, David Singer <singer@apple.com> wrote:

> The styling model used in TTML2 is not CSS and is not processable by a
> processor/rendering-engine designed to support HTML/CSS.  This leads to
> complex ‘come from’ process deep in rendering engines, where the behavior
> has to be dependent on whether the text ‘came from’ an HTML/CSS context or
> a TTML context.
>
> Please consider adopting CSS as-is, without embellishment or improvement.
>
> David Singer
> Manager, Software Standards, Apple Inc.
>
>
>
Received on Sunday, 1 October 2017 01:01:56 UTC

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