--- modules/node/node.module	Sun Nov 22 21:26:30 2009
+++ modules/node/node.module	Fri Nov 20 13:38:08 2009
@@ -340,6 +340,7 @@
   // 2. Avoid attribute content being elected as teaser.
   // Let the structural tags though, because they can be used later as boundaries on which to rely.
   
+  $body = preg_replace('#<[/A-Z][A-Z]*[ >/]#e', 'strtolower(\'$0\')', $body);
   $body = preg_replace('#<([/a-z]*)[^>]*>#', '<\1>', $body);
 
   // The teaser may not be longer than maximum length specified. Initial slice.