Diff tool for html documents, disregarding markup
jQuery: converting text into plain text including HTML Entities
Diff Match Path: http://code.google.com/p/google-diff-match-patch/
Underscore.js: Utility functions
to produce a html diff marking insertions and deletions using the
<ins> and <del> tags:
HtmlDiff.formatTextDiff(originalText, finalText)
see the code of this method to get the individual steps if you want the diff in array form.
This library is released under the MIT license