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

@annevk I think that it would also be reasonable to disallow lone surrogates. It’s [possible to get them into the input stream with document.write](https://html.spec.whatwg.org/multipage/parsing.html#parse-error-surrogate-in-input-stream) and they’re accepted as chardata unchanged via innerHTML, etc, but they’d normally end up converted to U+FFFD in html document parsing scenarios (e.g. if one “appeared” in a document parsed as UTF-8, WTF-8 style). Given the translation there would be non-ascii→non-ascii, it may not be a major hazard, but it’s pretty hard to imagine any benefit to allowing them in names and not too hard to imagine it causing problems.

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