The AnimationTimeline interface of the Web Animations API represents the timeline of an animation.
AnimationTimeline
MDN Reference
Readonly
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.
currentTime
null
The
AnimationTimeline
interface of the Web Animations API represents the timeline of an animation.MDN Reference