Loofah

It will fix broken markup, sanitize unsafe tags and transform markup for storage or display.

It's built on top of Nokogiri and libxml2.

And it uses html5lib's whitelist, so it won't make codes less secure.

What is new in this release:

• ActionView helpers now must be required explicitly: `require "loofah/helpers"`
• Support for Ruby 1.8.7 and prior has been dropped

What is new in version 2.0.2:

• ActionView helpers now must be required explicitly: `require "loofah/helpers"`
• Support for Ruby 1.8.7 and prior has been dropped

What is new in version 2.0.1:

• ActionView helpers now must be required explicitly: `require "loofah/helpers"`
• Support for Ruby 1.8.7 and prior has been dropped

What is new in version 0.2.1:

• Enhancement: when loaded in a Rails app, automatically extend ActiveRecord::Base with html_fragment and html_document.
• Bugfixes: ActiveRecord scrubbing should generate strings instead of Document or DocumentFragment objects.
• Bugfixes: init.rb fixed to support installation as a Rails plugin.