Re: [w3c/webcomponents] Should custom elements be adoptable if so, how? (#512)

> I think there will always be inconsistencies since built-in elements have "the same" definition in all windows. It can't really be avoided.

I disagree.  If we picked the behavior WebKit/Blink uses which is to keeping the original prototype and pull the definition from the old window, then custom elements will continue to function and appears to behave identically to builtin elements.

But if we can't agree on changing engine's behaviors for this issue, then we should just throw on adaptation so that we wouldn't be stuck with a forward incompatible behavior.

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