I use tweenmax 1.20.2 to tween object in canvas. I use lagSmoothing to make sure the tween run when my tab is not active. but it doesn't work. It works with version 1.91.1. here is my code:  window.addEventListener('blur', function () { TweenLite.lagSmoothing(0); }, false); window.addEventListener('focus', function () { TweenLite.lagSmoothing(1000, 16); }, false);   How to run with tweenmax 1.20.2. Thanks