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

> 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.

Do you think it would be acceptable to spec this behavior for custom elements (just like it is currently specced for built-in elements), despite Firefox not following the spec for built-in elements? Or do you think it's only OK to spec a useful behavior for custom elements if Firefox first changes its behavior for built-in elements to follow the current spec?

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