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Re: [css-animations] When/how are keyframe values computed?

From: L. David Baron <dbaron@dbaron.org>
Date: Fri, 8 Aug 2014 21:23:33 -0700
To: Sylvain Galineau <galineau@adobe.com>
Cc: "Tab Atkins Jr." <jackalmage@gmail.com>, "<www-style@w3.org>" <www-style@w3.org>
Message-ID: <20140809042333.GB30737@crum.dbaron.org>
On Saturday 2014-08-09 01:20 +0000, Sylvain Galineau wrote:
> 
> On Aug 8, 2014, at 5:38 PM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
> 
> > On Fri, Aug 8, 2014 at 5:35 PM, Sylvain Galineau <galineau@adobe.com> wrote:
> >> Yes. Also, keep non-animatable properties, switch non-interpolable values at half-way etc. (I'm still not clear on why we wouldn't do the latter for transitions but that's another topic).
> > 
> > We do - the resolution to change the behavior of non-animatable
> > properties was a general change to interpolation behavior, not an
> > Animation-specific one, unless I'm remembering incorrectly.
> 
> That was my recollection as well, but I thought David remembered differently. Maybe I misunderstood him.

http://lists.w3.org/Archives/Public/www-style/2012Nov/0261.html
specifically says (with emphasis as quoted):

>    - RESOLVED: Make *animations* transition *all* properties. Unless otherwise
>                specified, discrete properties take their starting values below
>                50% timing function progress, and end values above 50% timing
>                function progress.

In the text leading up to that resolution, I had written on IRC to clarify a previous comment:

>    <dbaron> (doesn't apply to transitions)

My understanding at the time was that we explicitly decided this did
not apply to transitions, and I still believe it should not.  I
think the point of the transitions spec is to take changes from
external sources and animate them when possible, and I don't think
that makes sense for properties that can't actually animate.

-David

-- 
𝄞   L. David Baron                         http://dbaron.org/   𝄂
𝄢   Mozilla                          https://www.mozilla.org/   𝄂
             Before I built a wall I'd ask to know
             What I was walling in or walling out,
             And to whom I was like to give offense.
               - Robert Frost, Mending Wall (1914)

Received on Saturday, 9 August 2014 04:24:02 UTC

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