From: Ryosuke Niwa [] 

> Or, we could always throw an exception in the constructor of 
> HTMLUnknownElement so that nobody could do it.  It would mean that libraries 
> and frameworks that do support custom elements without "-" would have to use 
> document.createElement but that might be a good thing since they wouldn't be 
> doing that in the first place.

That kind of breaks the design goal that we be able to explain how everything 
you see in the DOM was constructed. How did the parser (or 
document.createElement(NS)) create a HTMLUnknownElement, if the constructor for 
HTMLUnknownElement doesn't work?

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