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.

js
// 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