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[whatwg] WebVTT feedback (was Re: Video feedback)

From: Marc 'Tafouk' <wwg@millie.uk.to>
Date: Wed, 20 Jul 2011 02:06:03 +0200
Message-ID: <jbm.20110720020603.62552adf@AZIMUTH>
On Mon, 27 Jun 2011 at 09:32 AM, Silvia Pfeiffer  
<silviapfeiffer1 at gmail.com> wrote:
> I wanted to mention that Ronny's page at
> http://leanbackplayer.com/other/webvtt.html has had some updates
> recently and has now settled, with demos at
> http://leanbackplayer.com/test/webvtt.html .
>
> Note that where his implementation differs from the spec, he has made
> a note. There are only two such notes. I'd like to see these
> addressed, too.
>
> Cheers,
> Silvia.
>

Hello folks,

I've been following the latest developments on the WebVTT specification and 
am making an attempt to write an out-of-browser parser, using Anna 
Cavender's proposed patches to WebKit.

First, I filed a request on the bugtracker 
<http://www.w3.org/Bugs/Public/show_bug.cgi?id=13292> regarding the "end-
of-file marker" that's mentioned in the current draft 
<http://www.whatwg.org/specs/web-apps/current-work/#webvtt-cue-text-
parsing-rules>


I have another question about self-closing tags in cue text. It seems 
they're not supported at all.
The U+002F SOLIDUS character (/) is only handled in the WebVTT tag state.

Test case 1-a):
   WEBVTT

   00:00.000 --> 00:02.000
   Initial <b/> test

U+0062 (b) triggers "WebVTT start tag state"; U+002F is then handled as 
"Anything else" and is appended to result (tagname = "b/").


Test case 1-b):
   WEBVTT

   00:00.000 --> 00:02.000
   Initial <b /> test


U+0062 (b) triggers "WebVTT start tag state"; U+0020 (space) triggers  
"WebVTT start tag annotation state"; U+002F is handled as "Anything else" 
and is appended to buffer (annotation = "/").


I am aware those may be moot atm because there is no void element AFAIK, 
and the current tags make no sense when immediately closed.


I also found a slight issue when following the parser specs : there is no 
validation of the class attribute.

Test case 2):
   WEBVTT

   00:00.000 --> 00:02.000
   Second <c.......... [my annotation]> test

classes is a list of 10 empty strings.

Regards, Marc.
Received on Tuesday, 19 July 2011 17:06:03 UTC

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