Animation Effect Timing Properties

Element.animate(), KeyframeEffectReadOnly.KeyframeEffectReadOnly(), and KeyframeEffect.KeyframeEffect() all accept a dictionary object containing the following timing properties. These properties are all optional, although without setting a duration the animation will not play.

Syntax

var timingProperties = {
  delay: 1000,
  direction: "alternate",
  duration: 3000,
  easing: "ease-in",
  endDelay: 100, 
  fill: "both",
  iterationStart: 1.5, 
  iterations: Infinity
}

Properties

AnimationEffectTimingProperties.delay Optional

The number of milliseconds to delay the start of the animation. Defaults to 0.

AnimationEffectTimingProperties.direction Optional

Whether the animation runs forwards (normal), backwards (reverse), switches direction after each iteration (alternate), or runs backwards and switches direction after each iteration (alternate-reverse). Defaults to normal.

AnimationEffectTimingProperties.duration Optional

The number of milliseconds each iteration of the animation takes to complete. Defaults to 0.

AnimationEffectTimingProperties.easing Optional

The rate of the animation's change over time. Accepts the pre-defined values linear, ease, ease-in, ease-out, and ease-in-out, or a custom cubic-bezier value like cubic-bezier(0.42, 0, 0.58, 1). Defaults to linear.

AnimationEffectTimingProperties.endDelay Optional

The number of milliseconds to delay after the end of an animation. This is primarily of use when sequencing animations based on the end time of another animation. Defaults to 0. 

AnimationEffectTimingProperties.fill Optional

Dictates whether the animation's effects should be reflected by the element(s) prior to playing (backwards), retained after the animation has completed playing (forwards), or both. Defaults to none.

AnimationEffectTimingProperties.iterationStart Optional

Describes at what point in the iteration the animation should start. 0.5 would indicate starting halfway through the first iteration for example, and with this value set, an animation with 2 iterations would end halfway through a third iteration. Defaults to 0.0.

AnimationEffectTimingProperties.iterations Optional

The number of times the animation should repeat. Defaults to 1, and can also take a value of infinity to make it repeat infinitely.

Specifications

Browser compatibility

See also

• Element.animate()
• KeyframeEffect.KeyframeEffect()
• KeyframeEffectReadOnly.KeyframeEffectReadOnly()