Defines a new timeline container in an HTML document for sequentially timed elements.
accelerate , autoReverse , begin , beginAfter , beginEvent , beginWith , decelerate , dur , end , endEvent , endHold , eventRestart , repeat , repeatDur , syncBehavior , syncTolerance , timeAction
beginElement , endElement
onbegin , onend , onmediacomplete , onmedialoadfailed , onmediaslip , onpause , onrepeat , onresume , onresync , onreverse