$() is not in the API documentation
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Since $('my selector') is pretty much the *core* API for using jQuery, it would be nice if it was *present* at all; and preferably up front (say, first); in the API docs.
I can't even find $( on that page. Pretty big omission for anybody, starting from first principles, figuring out what that $('#myContentDiv') expression is meant to do.
I'll raise it as a DOCS BUG since $ is the primary jQuery API.
Hope this helps. Thanks.