Re: [whatwg/dom] Valid/Invalid characters in document.createElement() (#849)

My suggestion is to do a spec pull request to make it more concrete, and iterate on that (I'm happy to help) to make sure we've got it right. Then we can ask for broader support/review.

As for when to work on implementation and tests, that's a judgment call. The potential downside is doing implementation/test work and finding out that we missed something that makes it show-stoppingly objectionable, which would mean the implementation/test work is "wasted". But in this case I think it'd be relatively safe to do so in parallel, as I am hopeful that this change will not be controversial.

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