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[Bug 28266] [webvtt] 6.2.1 processing model handling of bidi [I18N-ISSUE-432]

From: <bugzilla@jessica.w3.org>
Date: Thu, 01 Oct 2015 22:34:10 +0000
To: www-international@w3.org
Message-ID: <bug-28266-4285-ZCUuIk3NHe@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=28266

--- Comment #22 from Silvia Pfeiffer <silviapfeiffer1@gmail.com> ---
(In reply to Glenn Adams from comment #21)
>
> > > If there are style properties that apply to the cue as a whole, and those
> > > properties require the use of a default directionality to resolve their
> > > computed value, e.g., the computed value resolved from 'start', 'end', etc.,
> > > then use of Bidi controls in the text will not suffice.
> > 
> > The writing direction in WebVTT is not determined from the cue text, but
> > through cue settings. The resolution of 'start' and 'end' alignments and
> > positioning is dependent on the paragraph directionality as determined by
> > BIDI, which in fact is the direction of the paragraph embedding level, so
> > we're good on that, too.
> 
> I'm afraid I don't agree. You are suggesting that the default bidi level for
> the paragraph is determined by the embedding level of the text content of
> the paragraph. However, that is not how the Unicode Bidi Algorithm works:
> the default bidi level of the paragraph is an input parameter to be used to
> determine the resolved levels of the paragraph's content, and not the other
> way around.

No, I'm not suggesting any such thing.

I'm saying that the default bidi level for the paragraph is irrelevant for
WebVTT cues, because we have the writing direction.

If you read how the cue text alignment works:
http://dev.w3.org/html5/webvtt/#dfn-webvtt-cue-text-alignment
you find that it depends on the writing direction (determined by a cue setting)
and on the BIDI paragraph direction (which according to
http://www.unicode.org/reports/tr9/ is specified as follows: "The direction of
the paragraph embedding level is called the paragraph direction.").

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