Right off the bat, on the first 3 examples, he shows how you need to use different APIs depending on the IE version.
That alone is enough reason to use jQuery and not having to bother.
That alone is enough reason to use jQuery and not having to bother.
I don't care who caused the problem. Just that it wasn't me, I can't fix it, and I have a deadline to meet and constraints to follow. jQuery is a lifesaver.