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"getElementById"
What is wrong with getElementById? It is still the fastest way to get element by id. getElementsByTagName is also commonly used.
What's strange to me is that we have these on ShadowRoot, but not DocumentFragment. I'd like ShadowRoot to be as close to DocumentFragment as possible just to keep the platform simpler to wrap your head around. That said, I really don't think we should expose getElementsBy*. We don't need more usages of live NodeLists in the platform.
These should live on DocumentFragment anyway. *** This bug has been marked as a duplicate of bug 22515 ***