I also noticed it is a PR9 so i gues it gets a huge amount of traffic. Sometimes websites that have very high traffic take measures to enable pages to load faster and use a few less "k" when doing so. Although to be honesy this doesnt apear to be the case in this instance. It just looks like genuine errors. They really shouldent have left the WC3 logo linking to theiir actual validation page though... That makes it look a lot worse.