[css3-animations] Constructing missing 0%/"from" and 100%/"to" keyframes

http://dev.w3.org/csswg/css3-animations/#keyframes

"If a 0% or "from" keyframe is not specified, then the user agent  
constructs a 0% keyframe using the computed values of the properties being  
animated. If a 100% or "to" keyframe is not specified, then the user agent  
constructs a 100% keyframe using the computed values of the properties  
being animated."

This doesn't specify at which point the computed values are being sampled.  
I assume it should be the point in time at which the animation starts  
applying (which may be before the animation starts, depending on  
'animation-delay').

-- 
Øyvind Stenhaug
Core Norway, Opera Software ASA