Gauntlet section is out of date with html5lib

Gauntlet section is out of date with html5lib and doesn't allow for things like "letter-spacing:-0.03em;". 
See http://code.google.com/searchframe#NXg3toovv0g/ruby/lib/html5/sanitizer.rb&q=gauntlet%20package:html5lib%5C.googlecode%5C.com&l=176