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Re: ISSUE-58 (showBackground animateable): shouBackground should not be animateable [DFXP 1.0]

From: Glenn A. Adams <gadams@xfsi.com>
Date: Sun, 19 Apr 2009 14:10:37 +0800
To: Public TTWG List <public-tt@w3.org>
Message-ID: <C610E15D.A417%gadams@xfsi.com>
i propose we take a different approach: make all styles animatable

i note that at present, the following are defined as being non-animatable:

tts:direction
tts:displayAlign
tts:dynamicFlow
tts:extent
tts:origin
tts:overflow
tts:unicodeBidi
tts:writingMode

in contrast, all of the (remaining) following properties are defined as
animatable:

tts:backgroundColor
tts:color
tts:display
tts:fontFamily
tts:fontSize
tts:fontStyle
tts:fontWeight
tts:lineHeight
tts:opacity
tts:padding
tts:showBackground
tts:textAlign
tts:textDecoration
tts:textOutline
tts:visibility
tts:wrapOption
tts:zIndex

there doesn't seem to be any principled reason for making any of the above
properties non-animatable; in fact, we have recently assumed that tts:origin
(and perhaps tts:extent) is animatable in order to move a region to a new
location; also, the following seem to be inconsistent on the surface:

* tts:textAlign is animatable, but tts:displayAlign is not
* tts:wrapOption is animatable, but tts:overflow is not

if one supports animation for one property, then it should be fairly trivial
to support animation on any other property;

therefore, i propose we make all the style properties animatable, which will
make usage and authoring less subject to special case exceptions;

glenn

On 4/18/09 3:03 AM, "Timed Text Working Group Issue Tracker"
<sysbot+tracker@w3.org> wrote:

> 
> ISSUE-58 (showBackground animateable): shouBackground should not be
> animateable [DFXP 1.0]
> 
> http://www.w3.org/AudioVideo/TT/tracker/issues/58
> 
> Raised by: Sean Hayes
> On product: DFXP 1.0
> 
> tts:showBackground is listed in the specification as animateable. I cant see
> why this is necessary. Unless we have a use case for this I propose it be set
> to animateable: none
> 
> 
> 
Received on Sunday, 19 April 2009 06:11:23 GMT

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