There are some, like this <a href="http://bugs.jquery.com/ticket/13193">one</a>, in that case, <code>div</code> will be an xml-node, without <code>innerHTML</code> property, so result of <code>getElementsByTagName</code> call will be an empty collection and <code>jQuery.support</code> will be almost empty.

Or if some code would include jQuery into naked nodejs enviroment, or would use spiderMonkey interpretator without DOM implementation with jQuery included.

jQuery would be broken anyway, but it would not throw exceptions right away, but those are very weird use-cases.