Index: includes/theme.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/theme.inc,v
retrieving revision 1.553
diff -u -p -r1.553 theme.inc
--- includes/theme.inc	20 Nov 2009 04:29:42 -0000	1.553
+++ includes/theme.inc	24 Nov 2009 04:53:36 -0000
@@ -1907,13 +1907,13 @@ function theme_feed_icon($variables) {
 /**
  * Generate the output for a generic HTML tag with attributes.
  *
- * This theme function should be used for tags appearing in the HTML HEAD of a
- * document (specified via the #tag property in the passed $element):
+ * This theme function is most commonly used for, but not restricted to tags
+ * appearing in the HTML HEAD of a document.
  *
  * @param $variables
  *   An associative array containing:
  *   - element: An associative array describing the tag:
- *     - #tag: The tag name to output.  Typical tags added to the HTML HEAD:
+ *     - #tag: The tag name to output. Typical tags added to the HTML HEAD:
  *       - meta: To provide meta information, such as a page refresh.
  *       - link: To refer to stylesheets and other contextual information.
  *       - script: To load JavaScript.
@@ -1924,12 +1924,19 @@ function theme_feed_icon($variables) {
  *       wrapper prefix.
  *     - #value_suffix: (optional) A string to append to #value, e.g. a CDATA
  *       wrapper suffix.
+ *     - #minimized: (optional) Can be set to TRUE or FALSE to force the
+ *       rendered output to use the minimized tag syntax (e.g., "<meta ... />")
+ *       or not (e.g., "<script ...></script>"). If not specified, this defaults
+ *       to the XHTML guidelines (http://www.w3.org/TR/xhtml1/#guidelines).
  *
  * @ingroup themeable
  */
 function theme_html_tag($variables) {
+  // http://www.w3.org/TR/xhtml1/dtds.html
+  static $tags_with_empty_content_model = array('area', 'base', 'basefont', 'br', 'col', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param');
   $element = $variables['element'];
-  if (!isset($element['#value'])) {
+  $minimized = isset($element['#minimized']) ? $element['#minimized'] : in_array(strtolower($element['#tag']), $tags_with_empty_content_model);
+  if ($minimized && !isset($element['#value'])) {
     return '<' . $element['#tag'] . drupal_attributes($element['#attributes']) . " />\n";
   }
   else {
@@ -1937,7 +1944,9 @@ function theme_html_tag($variables) {
     if (isset($element['#value_prefix'])) {
       $output .= $element['#value_prefix'];
     }
-    $output .= $element['#value'];
+    if (isset($element['#value'])) {
+      $output .= $element['#value'];
+    }
     if (isset($element['#value_suffix'])) {
       $output .= $element['#value_suffix'];
     }