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Why use jQuery when the native document.querySelector/querySelectorAll methods are available everywhere these days?

Chaining and applying to arrays of elements at the same time

Cross browser/backward compatibility, especially IE...

How far back do you need to be compatible? I'm pretty sure IE9 had all the necessary APIs, and it was released over seven years ago.

It's not just about compatibility, it's about implementation bugs. Even IE11 causes our larger apps enormous problems.