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From the jQuery API docs site for ready All three of the following syntaxes are equivalent: $(document).ready(handler) $().ready(handler) (this is not recommended) $(handler) After doing homework - reading and playing with the source code , I have no idea why $().ready(handler) is not recommended. The first and third ways, are exactly the same, the third option calls the ready function on a cached jQuery object with document : rootjQuery = jQuery(document); ... ... // HANDLE: $(function) // Shortcut for document ready } else if ( jQuery.isFunction( selector ) ) { return rootjQuery.ready( selector ); } But the ready function has no interaction with the selector of the selected node elements, The ready source code: ready: function( fn ) { // Attach the listeners jQuery.bindReady(); // Add the callback readyList.add( fn ); return this; }, As you can see, it justs add the callback to an internal queue( readyList ) and doesn't change or use the elements in the set. This lets you call the ready function on every jQuery object. Like: regular selector: $('a').ready(handler) DEMO Nonsense selector: $('fdhjhjkdafdsjkjriohfjdnfj').ready(handler) DEMO Undefined selector: $().ready(handler) DEMO Finally... to my question: Why $().ready(handler) is not recommended?

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