AnimationPlaybackEvent.currentTime

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The currentTime read-only property of the AnimationPlaybackEvent interface represents the current time of the animation that generated the event at the moment the event is queued. This will be unresolved if the animation was idle at the time the event was generated.

Value

A number representing the current time in milliseconds, or null.

Reduced time precision

To offer protection against timing attacks and fingerprinting, the precision of playbackEvent.currentTime might get rounded depending on browser settings.
In Firefox, the privacy.reduceTimerPrecision  preference is enabled by default and defaults to 20us in Firefox 59; in 60 it will be 2ms.

// reduced time precision (2ms) in Firefox 60
playbackEvent.currentTime;
// 23.404
// 24.192
// 25.514
// ...


// reduced time precision with `privacy.resistFingerprinting` enabled
playbackEvent.currentTime;
// 49.8
// 50.6
// 51.7
// ...

In Firefox, you can also enabled privacy.resistFingerprinting, the precision will be 100ms or the value of privacy.resistFingerprinting.reduceTimerPrecision.microseconds, whichever is larger.

Specifications

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

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes No Yes No No No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes No No No No Yes

See also

Document Tags and Contributors

Contributors to this page: fscholz, chrisdavidmills, rachelnabors
Last updated by: fscholz,