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

@ArkadiuszMichalski what do you mean, browsers don't do it? `<script>document.head.classList.add("x","y")</script>` in Live DOM Viewer clearly shows an attribute being added with as its value the tokens serialized.

No plans for exposing set serializing in some other way. And if you only use the `DOMTokenList` object to manipulate the attribute there shouldn't be a difference.

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