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AnimationEffect: getComputedTiming() method - Web APIs | MDN
An object which contains:
all of the properties of the object returned by AnimationEffect.getTiming()"auto" values are replaced by computed values that may depend on the type of AnimationEffect
the following additional properties:
endTime
A number indicating the end time of the effect in milliseconds from the effect's start. This is equal to activeDuration plus delay and endDelay.
activeDuration
A number indicating the total duration in milliseconds of all iterations of the effect. This is equal to duration multiplied by iterations (or zero if that product would be NaN
localTime
A number or null.
Indicates the length of time in milliseconds that the effect has run. This is equal to the currentTimenull if the effect is not associated with an animation.
progress
null or a number at least 0 and less than 1.
Indicates the effect's progress through its current iteration. At the start of the activeDuration, this equals the fractional part of iterationStart.
Returns null if the effect isn't mid-iteration, for example because the effect is in the delay or endDelay periods, the effect is finished, or localTime is null.
currentIteration
null or an integer number.
Indicates the index of the current iteration. At the start of the activeDuration, this equals the integer part of iterationStart.
Returns null whenever progress is null.
