https://www.w3.org/Bugs/Public/show_bug.cgi?id=13999
Having said that, we will likely support space-separated values for both add() and remove() in the near future.
-- Anne van Kesteren http://annevankesteren.nl/
Several people gave feedback regarding DOMTokenList. In particular about
making add()/remove() accept multiple values. Your feedback is now tracked
over here as DOMTokenList moved from HTML to DOM:
