Simon Fraser wrote: > Transitions provide interpolation between existing CSS property > value changes. In other words, if the 'left' property changes from > 10px to 100px, without a transition it will change instantaneously. > With a transition, it will change over time. This allows > transitions to have a nice fallback behavior in older browsers > which don't support them; users won't see the nice smooth changes, > but the changes still happen. > > The key concept with animations is that you apply style in order to > put an element into an animating state. Just as you use CSS to set > the highlight state of a button, you can use CSS to put an element > into a "bouncing" state. That state may be temporary (finite number > of iterations) or permanent (infinite). The properties in the > animation keyframes are applied after all other properties, and > override them, so animations don't provide nice fallback behavior > (older browsers simply won't show the animations). > > I think these concepts are different enough to warrant keeping them > separate. I agree that having a fallback (transitions) or not (animations) is a difference. But I'm unsure if that difference warrants one extra specification and another set of properties. And I don't think the "states" are fundamentally difference -- the "states" in transistions just seem to be a subset, or a cousin, of the states in "animations". A better reason for having two different specs/property-sets would be if it makes sense have both on the same element. I.e., are there any use cases where you would set both a transition and an animation on the same element? Here's a list of properties that seem to have the same function: transition-duration transition-timing-function transition-delay animation-duration animation-timing-function animation-delay So, we could at least save three properties (and probably a shorthand property, too) if the concepts were combined. This makes it worth investigating. And, don't forget my headache :) -h&kon Håkon Wium Lie CTO °þe®ª howcome@opera.com http://people.opera.com/howcomeReceived on Friday, 19 March 2010 20:41:12 UTC
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