Provides an active timeline for an HTML element.
accelerate , autoReverse , begin , beginAfter , beginEvent , beginWith , currTime , decelerate , dur , end , endEvent , endHold , eventRestart , localTime , onOffBehavior , progressBehavior , repeat , repeatDur , syncBehavior , syncTolerance , timeAction , timeline , timelineBehavior , timeStartRule
beginElement , endElement , pause , resume
onbegin , onend , onpause , onrepeat , onresume , onreverse