Re: [dom] Change DOMTokenList's add() return value. (#114)

> I think we can assume that.

I don't think so, so far HTML doesn't say anything about `<a>`, whereas that supports `noreferrer` and nowadays `noopener` as values for its `rel` attribute.

As for the enum values, they need to either not use spaces or use hyphens per https://w3ctag.github.io/design-principles/#casing-rules.

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