HTML nodes mutation observer

mutationObserver.js

var container = document.querySelector('body');

var observer = new MutationObserver(function(mutations){
  // Do something here
 mutations.forEach(function(mutation) {
      console.log('mutation.type = ' + mutation.type);
      for (var i = 0; i < mutation.addedNodes.length; i++) {
        console.log('  "' + mutation.addedNodes[i].textContent + '" added');
      }
      
      for (var i = 0; i < mutation.removedNodes.length; i++) {
        console.log('  "' + mutation.removedNodes[i].textContent + '" removed');
      }
    });
});

observer.observe(container, {
  childList: true,
  attributes: true,
  characterData: true,
  subtree: true,
  attributeOldValue: true,
  characterDataOldValue: true
});