Question

I was thinking about the jQuery $(document).ready event and it occurs to me that I’ve never seen anyone apply it on anything other than $(document). Is there any other legitimate use for it?

Answer 1

From the jQuery documentation:

The .ready() method can only be called on a jQuery object matching the current document, so the selector can be omitted.

They all do the same:

$(document).ready(handler)
$().ready(handler) (this is not recommended)
$(handler)

Source: http://api.jquery.com/ready/