Problem:

• W3 Validator says:

Warning: The type attribute is unnecessary for JavaScript resources.

Solution:

• In functions.php insert following code:

<?php 
function removeTypeJS($x) {
  ob_start();
  call_user_func($x);
  echo preg_replace("/type=['\"]text\/(javascript|css)['\"]/", '',ob_get_clean());
}
?> 

• Replace <?php wp_head(); ?> in template with: <?php removeTypeJS("wp_head"); ?>
• Replace <?php wp_footer(); ?> in template with: <?php removeTypeJS("wp_footer"); ?>