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

document.createElement("foo-bar", { is: "tadaa" });

https://dom.spec.whatwg.org/#concept-create-element
We don't have definition, so we take step 7.2, "is value set to is"


But if there is definition for foo-bar, we take step 6, where 11 "Set result’s is value to null. "

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