Re: [whatwg/dom] Non-builtin custom elements which don't have definition yet, may get non-null is-value (#659)

If element name is valid custom element name, then is value shouldn't be preserved, since is value is for builtins only.
I guess if createElement("button", {  is : "input"}); is used, storing is value doesn't make too much sense either. So, basically store is value only if it can be useful later?

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