This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The delay property of the Web Animations API represents the number of milliseconds to delay the start of the animation.

Note: Element.animate(), KeyframeEffectReadOnly.KeyframeEffectReadOnly(), and KeyframeEffect.KeyframeEffect() all accept an object of timing properties including delay. The value of delay corresponds directly to AnimationEffectTimingReadOnly.delay in timing objects returned by AnimationEffectReadOnly, KeyframeEffectReadOnly, and KeyframeEffect.


// Delay the animation by 1 second
var timingProperties = {
  delay: 1000


A number representing milliseconds. Defaults to 0.


In the Pool of Tears example, each tear is passed a random delay via its timing object:

// Randomizer function
var getRandomMsRange = function(min, max) {
  return Math.random() * (max - min) + min;

// Loop through each tear
tears.forEach(function(el) {  

  // Animate each tear
      delay: getRandomMsRange(-1000, 1000), // randomized for each tear
      duration: getRandomMsRange(2000, 6000), // randomized for each tear
      iterations: Infinity,
      easing: "cubic-bezier(0.6, 0.04, 0.98, 0.335)"


Specification Status Comment
Web Animations
The definition of 'delay' in that specification.
Working Draft Editor's draft.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support (Yes) 48 (48) No support (Yes) No support
Feature Android Android Webview Chrome for Android Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? ? ? No support No support No support

See also