Watch node inserted, alternative to MutationOvserver

watch.css

@keyframes nodeInserted {  
	from { opacity: 0.99; }
	to { opacity: 1; }  
}

.elementToWatch {
    animation-duration: 0.001s;
    animation-name: nodeInserted;
}

watch.js

var insertListener = function(event){
	if (event.animationName == "nodeInserted") {
		// This is the debug for knowing our listener worked!
		// event.target is the new node!
		console.warn("Another node has been inserted! ", event, event.target);
	}
}

document.addEventListener("animationstart", insertListener, false); // standard + firefox
document.addEventListener("MSAnimationStart", insertListener, false); // IE
document.addEventListener("webkitAnimationStart", insertListener, false); // Chrome + Safari