var text = document.querySelector("#text");

var observer = new MutationObserver(function(mutations) {

    mutations.forEach(function(mutation) {

      var entry = {

        mutation: mutation,

        el: mutation.target,

        value: mutation.target.textContent,

        oldValue: mutation.oldValue

      };

      console.log("Recording mutation:", entry);

    });

  });

​

observer.observe(text, {

    attributes: true,

    childList: true,

    characterData: true,

    characterDataOldValue: true,

    subtree: true

});