servo/servo — pull request #4353 by brunoabinader (2014-12-12 16:58:45+00:00)
Title: Implement DOMTokenList.{add,remove,toggle}

Specs:
https://dom.spec.whatwg.org/#dom-domtokenlist-add
https://dom.spec.whatwg.org/#dom-domtokenlist-remove
https://dom.spec.whatwg.org/#dom-domtokenlist-toggle
https://dom.spec.whatwg.org/#concept-dtl-update
https://dom.spec.whatwg.org/#concept-ordered-set-serializer