HTML Purifier 4.2.0 is a minor release that implements a number of
feature requests accumulated over half a year.  New configuration
options include %Core.RemoveProcessingInstructions,
%CSS.ForbiddenProperties, %HTML.FlashAllowFullScreen and
%Core.NormalizeNewlines.  Additionally,%URI.DisableResources is
now functional and file: is an optionally supported URI scheme.
There are also some minor bugfixes, usability improvements and
documentation updates.