Re: [dom] Spec for DOMTokenList stringifier disagrees with every single implementation (#105)

@annevk I mean, when invoking this methods, that browsers don't set asociated attr's value to "ordered set serializer for tokens", we still have repeated tokens and white space in asociated attr's value.

Backing to serializing, ok, but previouse solution was better, actually we have xxx solution to get attr's value by using one command line, but now it's impossible for `DOMTokneList` and 'DOMSettableTokenList', so output all tokens from list needs more work. Basically it will be only inconvenient for testing and can live with that.

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