The author also assumes that more developers know the raw DOM API than know jQuery. I think that very few developers know enough to write efficient, portable c

The author also assumes that more developers know the raw DOM API than know jQuery. I think that very few developers know enough to write efficient, portable client-side code using DOM calls directly. In my experience working with tons of different web developers, it's a lot faster for any developer (veteran or brand new) to learn and use a good framework like jQuery than to try to write cross-browser code without it.