Bug 903283: Don't include EventTarget.h in headers r=Ms2ger
Bug 717181 - Make <fieldset> invalid if they contain an invalid form control; r=mounir

This adds a CSS psuedo class to fieldset that acts much in the same way as the one
on form.
Bug 875250 - implement CSS parsing of text-orientation, text-combine-horizontal properties. r=dholbert