{ Mutation Observer }

JS prototype for observing DOM changes:

(function( $ ) {
            var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;

            function isDOMAttrModifiedSupported() {
                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;
            }

            $.fn.attrchange = function(callback) {
                if (MutationObserver) {
                    var options = {
                        subtree: false,
                        attributes: true
                    };
    
                    var observer = new MutationObserver(function(mutations) {
                        
                        mutations.forEach(function(e) {
                            callback.call(e.target, e.attributeName);
                        });
                    });
                    // loop through each observed
                    return this.each(function() {
                        
                        observer.observe(this, options);
                    });
    
                } else if (isDOMAttrModifiedSupported()) {
                    
                    return this.on('DOMAttrModified', function(e) {
                        callback.call(this, e.attrName);
                    });
                } else if ('onpropertychange' in document.body) {
                    return this.on('propertychange', function(e) {
                        callback.call(this, window.event.propertyName);
                    });
                }
            }
          

            $('#menu-small-right').attrchange(function(attrName) {
              console.log('Attribute: ' + attrName + ' modified ');
              }).css('height', 100);
          })( jQuery );