This exercise asks us to
All the target elements that computer considers even should shake. You should use the :even function to modify these elements.
Before that, it explained:
Note that jQuery is zero-indexed, meaning that, counter-intuitively, :odd selects the second element, fourth element, and so on.
This is not entirely obvious to everyone. Does everyone understand “zero-indexed”? Nope, indexing hasn’t been discussed yet, right, since we haven’t gotten into arrays and stuff. So, a little bit of clarification would help:
" Therefore, what you would normally consider even (targets 3 & 6) are actually considered odd by the computer, while targets 1, 5 & 2 are considered even."
Yes, I realize that if someone types in the wrong thing (odd) because they’re not looking at the UL on the bottom, they may notice they’ve selected the wrong buttons…But, as I mentioned elsewhere, not everyone is observant. Not everyone is a visually oriented learner. Heck, some visual learners can learn using videos but not using text.