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

A difference between the spec and browser implementations was raised here: https://bugs.chromium.org/p/chromium/issues/detail?id=1061436

[In the spec](https://dom.spec.whatwg.org/#dom-document-createelement), document.createElement should allow names that "match the Name production," which links to [this definition](https://www.w3.org/TR/xml/#NT-Name), which allows characters in many ranges, including `[#x10000-#xEFFFF]`, which I am guessing includes emojis and would therefore allow `
document.createElement('test-\u{1f602}')`

However, Chrome, Firefox, and Safari all throw exceptions when this code snippet is run.
Should the browsers update to match the spec, or should the spec be updated?
Or am I misinterpreting the spec? If the spec should be updated, what should it say instead?

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