W3C home > Mailing lists > Public > www-style@w3.org > April 2010

Re: transitions vs. animations

From: Brad Kemper <brad.kemper@gmail.com>
Date: Wed, 7 Apr 2010 11:58:41 -0700
Message-Id: <9BD252CF-8883-48F4-ADCA-C616B8F63C58@gmail.com>
To: Chris Marrin <cmarrin@apple.com>
Cc: "www-style@w3.org list" <www-style@w3.org>

On Apr 7, 2010, at 10:44 AM, Chris Marrin <cmarrin@apple.com> wrote:

> On Apr 7, 2010, at 6:37 AM, Brad Kemper wrote:
>> On Apr 7, 2010, at 12:05 AM, Maciej Stachowiak wrote:
>>> On Apr 5, 2010, at 3:32 PM, Tab Atkins Jr. wrote:
>>>> I'm not combining animations and transitions in general.  I'm
>>>> separating them further!  I am, however, allowing keyframes in
>>>> transitions, to address a use-case that we identified and that  
>>>> can't
>>>> be done well with the current draft.
>>> I like the idea of supporting keyframes for transitions in some  
>>> form.
>> My favorite so far for that is to have that keyframe animation  
>> completely self contained within a 'play()' function (taking the  
>> same arguments as the value of the 'animation' shorthand), assigned  
>> to a 'transition-[something]' property (such as 'transition- 
>> triggered-animation'). It's clean and simple and easily understood,  
>> and consistent with the separate 'animation' property.
> But that's not transition keyframes. That's simply trigger animation  
> keyframes using a property change as the trigger.

I never claimed it was anything different. When Maciej mentioned  
"supporting keyframes for transitions in some form", I assumed it was  
in reference to earlier conversation about inserting a keyframe-based  
animation into a transition so that it would play while the transition  
played, thus allowing a vertical bounce while transitioned 'left'.  
Perhaps I misunderstood.

> Transition keyframes would express the keyframes in terms of the  
> property being animated.

II was not attempting to define 'transition keyframes'.

> For instance, if I have a 'left' property of 0 and I set it to  
> 200px, I might want it to go 75% of the way to the destination, then  
> go back to 25% and then all the way. The keyframes would have to be  
> expressed in terms of these percentages. As I said in a previous  
> post, I don't think we should consider this for this release of the  
> Transitions spec.

Nor do I. Was this part of what was discussed in the thread so far? I  
might have missed that.
Received on Wednesday, 7 April 2010 18:59:27 UTC

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