Canonical orderthe unique non-ambiguous order defined by the formal grammar
Syntax
Formal syntax: <single-animation-fill-mode>#
animation-fill-mode: none
animation-fill-mode: forwards
animation-fill-mode: backwards
animation-fill-mode: both
The # indicates that several values may be given, separated by commas.
Each applies to the animation defined in the same order in animation-name.
animation-fill-mode: none, backwards
animation-fill-mode: both, forwards, none
Values
none
The animation will not apply any styles to the target before or after it is executing.
forwards
The target will retain the computed values set by the last keyframe encountered during execution. The last keyframe encountered depends on the value of animation-direction and animation-iteration-count:
animation-direction
animation-iteration-count
last keyframe encountered
normal
even or odd
100% or to
reverse
even or odd
0% or from
alternate
even
0% or from
alternate
odd
100% or to
alternate-reverse
even
100% or to
alternate-reverse
odd
0% or from
backwards
The animation will apply the values defined in the first relevant keyframe as soon as it is applied to the target, and retain this during the animation-delay period. The first relevant keyframe depends of the value of animation-direction:
animation-direction
first relevant keyframe
normal or alternate
0% or from
reverse or alternate-reverse
100% or to
both
The animation will follow the rules for both forwards and backwards, thus extending the animation properties in both directions.
