Loofah is a general library for manipulating HTML/XML documents and fragments.
It's built on top of Nokogiri and libxml2, so it's fast and has a nice API.
Loofah excels at HTML sanitization (XSS prevention). It includes some nice HTML
sanitizers, which are based on HTML5lib's whitelist.

WWW: https://github.com/flavorjones/loofah