an all platform mutation observer that has never been tested - so use at your own risk `attrWatcher.watch(objArray, callbackFunction);`

Attribute Watcher.js

var attrWatcher = (function() {
  "use strict";

  var isDOMAttrModifiedSupported, MutationObserver, attrchange, observer, disconnect;

  isDOMAttrModifiedSupported = function() {
    var p = document.createElement('p');
    var flag = false;

    if (p.addEventListener) p.addEventListener('DOMAttrModified', function() { flag = true }, false);
    else if (p.attachEvent) p.attachEvent('onDOMAttrModified', function() { flag = true });
    else return false;

    p.setAttribute('id', 'target');
    return flag;
  }

   //initialize Mutation Observer
   MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;

   attrchange = function(ele, callback) {
    if (MutationObserver) { //Modern Browsers supporting MutationObserver

      var options = {
        subtree: false,
        attributes: true,
        attributeOldValue: true
      };

      observer = new MutationObserver(function(mutations) {
        mutations.forEach(function(e) {
          callback.call(e.target, e, e.attributeName);
        });
      });

      for(var i=0; i<ele.length; i++) {
        observer.observe(ele[i], options);
      }

    } else if (isDOMAttrModifiedSupported()) { //Opera but really bad memory performance
      for(var i=0; i<ele.length; i++) {
        ele[i].on('DOMAttrModified', function(e) {
          callback.call(this, e, e.attrName);
        });
      }
    } else if ('onpropertychange' in document.body) { // Fuck You IE
      for(var i=0; i<ele.length; i++) {
        ele[i].on('propertychange', function(e) {
          callback.call(this, e, window.event.propertyName);
        });
      }
    }
  }

  disconnect = function() {
    if (MutationObserver) {
      observer.disconnect();
    }
  }

  return {
    watch: attrchange,
    disco: disconnect
  }

})();

attrWatcher.min.js

var attrWatcher=function(){"use strict";var e,t,n,r,i;e=function(){var e=document.createElement("p");var t=false;if(e.addEventListener)e.addEventListener("DOMAttrModified",function(){t=true},false);else if(e.attachEvent)e.attachEvent("onDOMAttrModified",function(){t=true});else return false;e.setAttribute("id","target");return t};t=window.MutationObserver||window.WebKitMutationObserver||window.MozMutationObserver;n=function(n,i){if(t){var s={subtree:false,attributes:true,attributeOldValue:true};r=new t(function(e){e.forEach(function(e){i.call(e.target,e,e.attributeName)})});for(var o=0;o<n.length;o++){r.observe(n[o],s)}}else if(e()){for(var o=0;o<n.length;o++){n[o].on("DOMAttrModified",function(e){i.call(this,e,e.attrName)})}}else if("onpropertychange"in document.body){for(var o=0;o<n.length;o++){n[o].on("propertychange",function(e){i.call(this,e,window.event.propertyName)})}}};i=function(){if(t){r.disconnect()}};return{watch:n,disco:i}}()