IE11/EDGE - function connect fails

[steelraiden]

in
ResizeObserverController.prototype.connect_ = function ()

// Subscription to the "Transitionend" event is used as a workaround for
// delayed transitions. This way it's possible to capture at least the
// final state of an element.
document.addEventListener('transitionend', this.onTransitionEnd_);

document.ontransitionend is undefined in IE11/EDGE

[taylorhakes]

I don't think this has to do with this library. Please reopen if you have more details