Re: [whatwg/dom] Definition of valid shadow elements is ambiguous (#745)

Oh, so "a valid custom element name" was intended to be one of the alternatives in that enumeration?  Then it's even worse than I thought, because that meaning didn't even occur to me. I might have understood it like that if there had been a colon after the "not", maybe. @rniwa's first suggestion have that same problem IMO.  The second suggestion is better but still rather convoluted.  Perhaps making an explicit listing of alternatives is better:

Context object’s local name must be one of the following:
* a valid custom element name
* "article", "aside", "blockquote", "body", "div", "footer", "h1", "h2", "h3", "h4", "h5", "h6", "header", "main" "nav", "p", "section", or "span"

If it's not, then throw a "NotSupportedError" DOMException.

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