diff --git a/theme/standard/header.html b/theme/standard/header.html
index 2968d1aa3f2..5c2b8ea3a5c 100644
--- a/theme/standard/header.html
+++ b/theme/standard/header.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
 <html<?php echo $direction ?>>
 <head>
     <?php echo $meta ?>
@@ -39,7 +39,7 @@
     </div>   
 <?php } else if ($heading) { // If no navigation, but a heading, then print a line  
 ?>
-        <hr size="1" noshade="noshade" />
+        <hr noshade="noshade" />
 <?php } ?>
     <!-- END OF HEADER -->
     <div id="content">
