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http://lists.w3.org/Archives/Public/www-style/2011Feb/0556.html
Current wording (3.8 The animation-delay property): # The 'animation-delay' property defines when the animation will start. # It allows an animation to begin execution some time after it is applied. # An 'animation-delay' value of ā0sā means the animation will execute as # soon as it is applied. Otherwise, the value specifies an offset from # the moment the animation is applied, and the animation will delay # execution by that offset. Proposed wording: # The 'animation-delay' property defines when the animation's first # iteration will start. This allows an animation to begin execution # some time after it is applied. An 'animation-delay' value of ā0sā # means the animation will execute as soon as it is applied. Otherwise, # the value specifies an offset from the moment the animation is applied, # and the animation will delay execution by that offset.
I think it would be useful to mention how negative animation-delay behaves.
The next paragraph covers negative delays: # If the value for 'animation-delay' is a negative time offset then # the animation will execute the moment it is applied, but will appear # to have begun execution at the specified offset. That is, the animation # will appear to begin part-way through its play cycle. In the case where # an animation has implied starting values and a negative 'animation-delay', # the starting values are taken from the moment the animation is applied. Or do you mean we should cover the case where the delay is > duration AND iteration-count > 1?
"Or do you mean we should cover the case where the delay is > duration AND iteration-count > 1?" Clarifying as this may be puzzling: the question here is whether we ought to define what happens when animation-delay <= (-1 x animation-duration); for instance, what happens in cases such as: animation-duration: 5s; animation-delay: -5s; animation-duration: 5s; animation-delay: -6s; animation-duration: 5s; animation-iteration-count: 2; animation-delay: -6s;
Resolved per 2014-09-09 WG decision.