<pre id="display"></pre>
<script src="../dist/diff.js"></script>
<script>
var one = 'beep boop',
    other = 'beep boob blah',
    color = '',
    span = null;

var diff = Diff.diffChars(one, other),
    display = document.getElementById('display'),
    fragment = document.createDocumentFragment();

diff.forEach(function(part){
  // green for additions, red for deletions
  // grey for common parts
  color = part.added ? 'green' :
    part.removed ? 'red' : 'grey';
  span = document.createElement('span');
  span.style.color = color;
  span.appendChild(document
    .createTextNode(part.value));
  fragment.appendChild(span);
});

display.appendChild(fragment);
</script>
<style>
  #result { word-wrap: break-word; }
</style>