Which CSS selectors can you NOT use in jQuery?

You're working on a site that uses an old version of jQuery, and you want to update to a newer version. What's the most efficient way to do so?

Let's say you have a page with just one link on it. How can you change the anchor tag so it links to example.com?

What does $() mean in jQuery?

Along with DOM traversal and manipulation, jQuery offers several general-purpose helper functions that fill in some JavaScript gaps, especially before ES2015. Which is NOT a jQuery utility function?

How can you get an AJAX request to go through without triggering any of jQuery's AJAX events?

Which command selects an element using its ID?

What does the jQuery attr() function do?

Which method is used to hide selected elements?

Is it possible to use jQuery together with AJAX?

What does this script do? $(function() { $( '#effect' ).animate({ backgroundColor: '#fff' }, 1000 ); });