[css2] What are they doing here?

--HG--
extra : convert_revision : svn%3A73dc7c4b-06e6-40f3-b4f7-9ed1dbc14bfc/trunk%402183

Author: bert-github

css2/bin/mkidx

@@ -70,6 +70,9 @@ foreach $e (@sorted) {
 	    foreach (ord($prevletter)+1 .. ord($letter)) {
 		# Be careful about quotes and double quotes.
 		unless ($_ == 34 || $_ == 38 || $_ == 39) {
+		    print OUTPUT "<a name=\"index-" . chr($_) . "\">&nbsp;</a>";
+		}
+	    }
 	    print OUTPUT "\n<ul class=\"index\">";
 	    $prevletter = $letter;
 	    $lvl++;