The non-normative appendix ‘HTML Compatibility Guidelines’ of the XHTML 1 specification says:
С.3. Element Minimization and Empty Element Content
Given an empty instance of an element whose content model is not
EMPTY
(for example, an empty title or paragraph) do not use the minimized form (e.g. use<p> </p>
and not<p />
).
XHTML DTD specifies script elements as:
<!-- script statements, which may include CDATA sections -->
<!ELEMENT script (#PCDATA)>