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function log(msg, animation) {
  var t = "<br/>" + msg 
        + ", animation.timeline=" + JSON.stringify(animation.timeline)
        + " & is document.timeline=" + (animation.timeline == document.timeline);
  document.body.innerHTML += t;
}
log ('explicit null', new Animation(null, null));
log ('explicit undefined', new Animation(null, undefined));
log ('implicit undefined', new Animation(null));
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majidopro
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