AnimationTimeline: currentTime property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2020.
The currentTime
read-only property of the Web Animations API's AnimationTimeline
interface returns the timeline's current time in milliseconds, or null
if the timeline is inactive.
Value
A number representing the timeline's current time in milliseconds, or null
if the timeline is inactive.
Reduced time precision
To offer protection against timing attacks and fingerprinting, the precision of animationTimeline.currentTime
might get rounded depending on browser settings. In Firefox, the privacy.reduceTimerPrecision
preference is enabled by default and defaults to 2ms. You can also enable privacy.resistFingerprinting
, in which case the precision will be 100ms or the value of privacy.resistFingerprinting.reduceTimerPrecision.microseconds
, whichever is larger.
For example, with reduced time precision, the result of animationTimeline.currentTime
will always be a multiple of 0.002, or a multiple of 0.1 (or privacy.resistFingerprinting.reduceTimerPrecision.microseconds
) with privacy.resistFingerprinting
enabled.
// reduced time precision (2ms) in Firefox 60
animationTimeline.currentTime;
// Might be:
// 23.404
// 24.192
// 25.514
// …
// reduced time precision with `privacy.resistFingerprinting` enabled
animationTimeline.currentTime;
// Might be:
// 49.8
// 50.6
// 51.7
// …
Specifications
Specification |
---|
Web Animations # dom-animationtimeline-currenttime |
Browser compatibility
BCD tables only load in the browser
See also
- Web Animations API
AnimationTimeline
DocumentTimeline
inherits this propertyDocument.timeline
returns a timeline object which inherits this property