Re: [dom] "A DOMSettableTokenList object is equivalent to ..." (#81)

Looking at the history of this API in HTML I think DOM is simply wrong here. Not sure how that happened. `DOMSettableTokenList` should have an associated content attribute.

As for the other question, setting `value` should probably just set the content attribute which in turn runs the set parser.

Paging @bzbarsky and @domenic to make sure I'm not missing anything.

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