W3C home > Mailing lists > Public > www-style@w3.org > February 2012

Re: [css3-animations] Editability of CSS 3 Animations

From: François REMY <fremycompany_pub@yahoo.fr>
Date: Fri, 3 Feb 2012 17:49:07 +0100
Message-ID: <90D542B80A2C4AAA90CCD3E4F4E2694E@FREMYD2>
To: "CSS 3 W3C Group" <www-style@w3.org>
To me, it seems reasonable that an animation could propose its own default
timing options. When you build an animation, you clearly know which time
frame you target. After that, there may be some variations, but clearly that
should remain the exception.

Having just to set :

    @keyframes myFirstAnim (duration: 1s, other-option: 2) { ... }
    @keyframes mySecondAnim (duration: 1s, other-option: 2) { ... }
    selector { animation: myFirstAnim, mySecondAnim; }

would be perfectly fine. Then, you could override the default behavior if
you really need it :

    selector { animation: myFirstName 2s, mySecondAnim 0.5s; }

but, usually, this is not the kind of things you would like to do. I used 
animations quite a lot when doing WPF/Silverlight, I never defined the 
timing anywhere else than in the storyboard :

    <DoubleAnimation From="1.0" To="0.0" Duration="0:0:5" />

An animation is calibrated for a specific timing and if your designer 
decides to change the timing of the animation (because he's adding or 
removing steps, for example), it should be possible to do it *inside the 
keyframes/storyboard* and not by searching the whole css if there's 
somewhere a rule that will impact the timing.

If I go to the end of my reasoning, I would even allow the 
animation-duration property to take a percentage as a value. That way, you 
can define an acceleration or a slow down relatively to the initial timing, 
and if the @keyframe timing change, the durations remains proportionnal to 
the new default value.

    @keyframes moveCar {
        options: { duration: 1s }

    img.car { animation: moveCar; }
    img.old.car { animation-duration: 120%; }

At a later date, I can change the 'moveCar' duration to 2s and have the old 
cars still be 20% slower than normal cars.

Best regards,

-----Message d'origine----- 
From: Tab Atkins Jr.
Sent: Friday, February 03, 2012 3:54 PM
To: Daniel Glazman
Cc: www-style@w3.org
Subject: Re: [css3-animations] Editability of CSS 3 Animations

On Fri, Feb 3, 2012 at 6:48 AM, Daniel Glazman
<daniel.glazman@disruptive-innovations.com> wrote:
> Le 03/02/12 15:41, Tab Atkins Jr. a écrit :
>> Can't you just make up some reasonable defaults?  Or, if you want to
> Unfortunately no. The default value for animation-duration being 0,
> it's just impossible to do that?

I meant make up some reasonable defaults *for the purpose of
previewing*.  You even suggest that perhaps 1s would be a good default
duration.  Just use that in your preview to show the general effects
of the keyframes while people are editting them.

Obviously, if someone is editting the application of an animation to
an element, you should use the values specified on that element.  But
I gathered from your post that the main problem was previewing

Received on Friday, 3 February 2012 16:49:34 UTC

This archive was generated by hypermail 2.4.0 : Friday, 25 March 2022 10:08:11 UTC