s unnecessary and if it's not preinstalled in the stack you're using, then you're doing a disservice to your site by adding it just because you need a simple AJAX call or want to add form validation or some other pre-built feature. You need to know things like the <a href="https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector">querySelector</a>, how to clone or destroy nodes manually so that you don't end up loading a huge library, when a straightforward DOM selector already exists.</p>
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