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Re: [css3-transitions] Spec should mention mismatch in list lengths

From: L. David Baron <dbaron@dbaron.org>
Date: Fri, 7 Aug 2009 14:35:37 -0700
To: www-style@w3.org
Message-ID: <20090807213537.GA24615@pickering.dbaron.org>
On Monday 2009-05-18 11:43 -0700, L. David Baron wrote:
> On Monday 2009-05-18 11:29 -0700, Chris Marrin wrote:
> > We follow the CSS rules for the background property, described in CSS3:
> >
> >     http://www.w3.org/TR/css3-background/#layering
> 
> Except the rules for 'background' layers have been changed so that
> the number of layers is the number of values for 'background-image':
> 
>   http://dev.w3.org/csswg/css3-background/#layering
> 
> > We follow this literally, so your last two examples would actually  
> > produce 4 transitions, with the 'color' property being duplicated. This 
> > would reduce back down to 3 transitions because the first 'color'  
> > property animation would be overridden by the second. So in your last  
> > example you'd end up with a color transition of 9738 seconds.
> >
> > I think this is the appropriate way to interpret this rule. Adding  
> > special cases (as in your rules 2 and 3) just gives authors more things 
> > to remember.
> 
> I don't think it's particularly hard to remember that the number of
> transitions is the number of values of 'transition-property', which
> is really all I was proposing.

And, to follow up on this issue:

If the resolution of the issue in
http://lists.w3.org/Archives/Public/www-style/2009May/0153.html is
that the first one wins, then it would be undetectable which choice
we take here (all or just 'transition-property').

However, if the resolution of that issue is (as proposed) that the
last one wins, then extending the transition-property list can lead
to rather strange behavior.

So I'd prefer to say that the number of transitions is the number of
values of 'transition-property'.

-David

-- 
L. David Baron                                 http://dbaron.org/
Mozilla Corporation                       http://www.mozilla.com/
Received on Friday, 7 August 2009 21:36:21 GMT

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