http://docs.jquery.com/Manipulation/clone repairs problems with Node.cloneNode().

But some information not visible via innerHTML is lost.

The attached file should show

original. value=changed

original.defaultValue=initial

clone. value=changed

clone.defaultValue=initial

but on IE6 shows

original. value=changed

original.defaultValue=initial

clone. value=changed

clone.defaultValue=changed

This likely also a problem for defaultSelected and defaultChecked.

To test this in practice, create a form, change the contents of text input, click radio buttons, checkboxes, and select lists. Then close the form. If the bug is fixed, reset()ing the original and clone should return them to a similar state.