code: function onDomMutate(event) {
  
  	var mutation = {
  		addedNodes: [],
  		removedNodes: [],
  	};
  	mutation[
  		(event.type === 'DOMNodeInserted' ? 'added' : 'removed') + 'Nodes'
  	] = [event.target];
  
  	domMutations.push(mutation);
  
  	// Delay the call to checkMutations()
  	setTimeout(function() {
  		checkMutations(domMutations);
  		domMutations = [];
  	});
  
  }
docs: Event handler for DOMNodeInserted and DOMNodeRemoved
  
  @param  {MutationEvent} event