W3C home > Mailing lists > Public > public-tt@w3.org > April 2009

Re: ISSUE-59: inconsistencies regarding animatability of style properties [DFXP 1.0]

From: Glenn A. Adams <gadams@xfsi.com>
Date: Mon, 20 Apr 2009 07:36:26 +0800
To: Sean Hayes <Sean.Hayes@microsoft.com>, Public TTWG List <public-tt@w3.org>
Message-ID: <C611D67A.A435%gadams@xfsi.com>

Could be, but I'm not prepared to go there at this time. These are local
attributes, and not global attributes, which somewhat complicate the usage
and semantics. The current animation model is based on the so-called
sandwich layer that applies to style properties (alone) where temporary
changes are made to computed values (and then subsequently restored).
Animating region and style would go outside this model and would certainly
require more implementation effort (I know our implementation could not
readily support this).

On 4/19/09 10:36 PM, "Sean Hayes" <Sean.Hayes@microsoft.com> wrote:

> It occurs to me also that by the same argument, there is no reason that
> attributes like @region and @style could not also be animatable, (it which
> might even give motivation for the inherit value).
> 
> e.g.:
> 
> <p begin="1s" dur="3s" region="ordinaryCaption">
>    <set begin="2s" dur="1s" region="offsetCaptionLeft"/>Phrase being
> interrupted</p>
> <p begin="2s" dur="2s" region="offsetCaptionRight">
>    <set begin="1s" region="ordinaryCaption "/>Interrupting phrase</p>
> 
> In such a case, it might be useful to be able to override a local style to the
> inherited value, but where one might not know what the currently applicable
> inherit was.
> 
> Just a thought.
> 
> Sean Hayes
> Media Accessibility Strategist
> Accessibility Business Unit
> Microsoft
> 
> 
> -----Original Message-----
> From: public-tt-request@w3.org [mailto:public-tt-request@w3.org] On Behalf Of
> Timed Text Working Group Issue Tracker
> Sent: 19 April 2009 1:42 PM
> To: public-tt@w3.org
> Subject: ISSUE-59: inconsistencies regarding animatability of style properties
> [DFXP 1.0]
> 
> 
> ISSUE-59: inconsistencies regarding animatability of style properties [DFXP
> 1.0]
> 
> http://www.w3.org/AudioVideo/TT/tracker/issues/59
> 
> Raised by: Glenn Adams
> On product: DFXP 1.0
> 
> properties
> 
> tts:direction
> tts:displayAlign
> tts:dynamicFlow
> tts:extent
> tts:origin
> tts:overflow
> tts:unicodeBidi
> tts:writingMode
> 
> are not defined as animatable, and no rationale for lack of animatability is
> described;
> 
> to simplify animation model, i propose to make all style properties animatable
> 
> 
> 
> 
Received on Sunday, 19 April 2009 23:37:09 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Monday, 2 November 2009 22:41:42 GMT