Javascript validation of html markup in a textarea object

Question

I'm surprised that I can't find anything on the net regarding javascript plugins to validate textarea objects for valid html markup. But the well is dry: does anyone know of a good example script that will parse the contents of a specified input and return false if it finds broken html markup within?

Answer 1

John Resig, the creator of jQuery, wrote an HTML parser:

http://ejohn.org/blog/pure-javascript-html-parser/