Returns 'true' if this Timeline has finished and should be removed from the Tween Manager. Otherwise, returns false.
The current time. Either a High Resolution Timer value if it comes from Request Animation Frame, or Date.now if using SetTimeout.
The delta time in ms since the last frame. This is a smoothed and capped value based on the FPS rate.
true if this Timeline has finished and should be removed from the Tween Manager.