Re: [whatwg/dom] get rid of NonElementParentNode? (#298)

Please do explain (I'm not sarcastic, I'm actually curious), because I'm having trouble understanding the cause of this too.

Suggesting that people actually use `someElement.getElementById()` and expecting it to throw in normal execution is akin to saying "well, `Number.isNaN` used to throw a TypeError, so we can't use that because someone is relying on that behavior".

It's not normal behavior, it's exceptional, so I don't see how the argument holds. 

As for "there are bigger warts", yes, that's definitely true, how does that diminish the size of *this* wart?

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