ZF-3339: DtDdWrapper is not xhtml valid for radio buttons   The
empty definition term which is placed using Zend_Form when radio
buttons are being generated is not XHTML valid. Therefore I
suggest that, if the doctype is set to XHTML, the wrapper either
doesn't place the empty definition term  , or places a
nonbraking space inside it &nbsp;. This has been fixed if no
label is set (http://framework.zend.com/issues/browse/ZF-2989)
but appearantly radio buttons use different 'label generation'
by default. I think this is also the case with checkboxes.   Can
you post a small reproduce case to clearly show this behavior,
please?  $radio = new Zend_Form_Element_Radio('radio');
$radio->addMultiOptions(array('radio_1'=>'Radio 1',
'radio_2'=>'Radio 2', 'radio_3'=>'Radio 3'));
$form->addElements(array($radio));  without any decorators etc.
the above php code will output the following html (I also don't
understand why the style="white-space: nowrap;" is being
generated by default, but that's another issue perhaps):  Rad